Thank everybody for sharing your experiences.
There is some information about life in Iran on a useful Website that I copied and paste it here:

Family life
Family is a very important issue in Iran. Usually young people live with their parents till their marriage time unless they have to leave the family because of education or work issues. On average, women marry at nearly 28 and men at 30.

Geography of Iran
Iran is located in south west part of Asia and is part of middle east countries. More than 79 million people live here.

The total land area is 6.1 million sq km (2.4 million sq Miles) .It is the 17th biggest country in the world.

Tehran is the most densely populated and the capital city and then respectively Khorasan Razavi , Isfahan and Fars.

The north and west part tend to be mountains and has the highest point of Iran on Damavand mountain with 5600 m height and in the middle side becomes flatter to the south.

The most interesting part about Iran’s weather is that you can see all 4 seasons weathers at the same time, in different parts of the country, which makes exciting to travel through Iran.

The weather varies according to region. Winters in north are wet rather than very cold, and snow is rare. In west parts of the country, have the coldest winters and most snow. The South is wet and warmest and middle has driest part of the country. Northern areas get the most rainfall.
History of Iran

Iran has one of the most ancient histories in the world which refers to more than 2500 years ago …!

The point that makes Iran great empire distinct with other big empires in those times is Human right laws.

Iran has the first human right statement in the world by king Cyrus,as an example to prove this : all the workers who were working for construction of biggest palaces in those time were paid by king, retired people were paid as well and even women had pregnancy vacation while they were paid by king, all of this human right laws was exist in Iran while other big empires in those time were using slaves.

Because of this long history there are so many ancient attracts like places, customs, traditions, stories … .

People in Iran
Iranian were always welcomed to it’s guests and has always welcomed tourists and in the past five years numbers have dramatically increased, initially from EU.

Iranian are also famous by being hospitable. They invite you to their own homes and lodge you kindly.

You can find here various allegiances:

Kord,Lor,Azeri,Baluch,Gilak,…

Each has their own customs, traditions, dance, language or accent , …

You can also find various religion in iran like Shia Islam, Sunni Islam, Zoroastrian (Zartoshti in Persian), Christianity,…, but the official religion is Shia Islam .

Smaller towns and villages may retain a more traditional Iranian’s culture. Iran is a very tolerant society and most people live happily side by side.

Languages
Persian is the official language of Iran. In each province like Azerbaijan, Chahar mahal va bakhtiari , Lorestan , Baluchestan ,….. you can find various languages between local people which are respectively turkish, kurdish ,lorish , Baluch,….

About the different regional accents in Iran: These do exist but Teachers and host families will always speak very clearly Persian, and they are unlikely to encounter any problems with local accents.

Getting around Iran
Transport links are good and it is possible to get to most places by plane, bus and train.
In the following information has written some website addresses which you can book in advance your proper vehicle but the websites are in Persian language . if you need help for going through websites can contact to Iran Rental company.

Flying: There are now airports serving the Iran’s cities and many major towns. You can book in advance on : (http://www.zoraq.com)

Train travel: Some cities and most of the major towns have a train service. Most of the lines radiate out from Tehran. Long-distance services, such as between Tehran and Mashhad, are very fast: local services can be slower. It is worth advising to buy tickets or to book in advance on: (http://www.raja.ir)

Coach travel: National Express coach services cover most of the Iran and are very
cheap way to travel you can book on : (http://www.payaneh.ir)

Driving: If your driving license was issued outside Iran there may be restrictions on what and for how long you can drive here.
If you are a visitor, resident or student and have a driving license issued in the country you have come from, there are certain conditions that affect how long you can drive, and what you can drive in Iran. For more information and to get your legal driving license by legal lowers you can contact to Iran Rental company.
Roads are often very busy in the morning and evening, particularly on Fridays afternoon and before national holiday weekends. For checking information about traffic in cities or roads the best way is Google Map.
But this is not the best way to get around Tehran by your own car as there is a central area toll (the congestion charge), it is busy, and find a place in parking is so difficult.

Outside Tehran : Major cities have good bus services and often a metro. Cycle lanes are not common on roads and pavements, only in some parks. Towns usually have bus services.
Taxis: Taxis are the safest option for getting home late at night. Taxis can be hired with a wave on the street.

Inside Tehran: Tehran’s underground train service, often called the Metro, is the quickest way to get around most of the city provinces because of the heavy traffic. It runs till 10:30 at night.
There are two kind of buses, BRT buses & simple buses.
BRT buses is a good way to see Tehran and go through most areas, though it can be slower but it is a 24 hours service.
Buy Buscards which you can charge it as much as you want in special electronic stations, each time only 4000 Rials cost reduce, and for each city you should buy a different card and you can use it only inside the cities.
Buscards also use for underground train in Tehran.
Yellow or Green cabs (taxis) are much safer than any other car in Tehran (because there are some private cars as well). These are share taxies , it means the driver can pick 3 other people in his taxi up at the same time and these taxies goes from determined origin and destination. They have also some stations specially in famous squars of the city but you can also order door to door taxi by “Snapp” which is the best taxi in Tehran. You just need internet connection to use this service.
– cheaper than other taxis
– 24 hours
– very short waiting time(even at midnight)
– show location on google map
– info about prices before ordering
– info about driver , plate number of taxi , color and type of car.

You can register(free) & download(free) it on this link :
https://snapp.taxi/passenger/rentaliran
For registration click on top link, enter your Iranian mobile number Then click on :
“دریافت اسنپ و … اعتبار اسنپ”
now you can download snapp application by “app store” or “google play” or …
After installing process you can change language of this app to English or Francis.
First trip has discount.

Snapp use in Tehran, and also been active in Isfahan & Karaj recently.

Iranian money matters
There is one interesting point about money in Iran that there is 2 currency! Rial (ریال) and Toman (تومان) . Rial(ریال) is the official unit of the country and has written on all the moneys, this unit use in banks and ATM machines, but all the people use Toman when they are talking about money like going shopping or in the taxies! Nobody ask the money in Rials but sometimes while you are shopping the price has written in Rials. Each Toman is worth 10 Rial.

Signs of Rial : ریال , Rials , RLs .
Sign of Toaman : تومان, Toman ,T , تومن , ت.

Every Iranian bank note has a picture of the Imam Khomeini (Leather of the Islamic Republic of Iran) on one side. The most common banknotes are :

10,000Rls (1000 Toman) Dah Hezar Rial or Hezar Toman
20,000Rls (2000 Toman) Bist Hezar Rial or Do Hezar Toman or Do Toman
50,000Rls (5000 Toman) Panjah Hezar Rial or Panj Hezar Toman or Panj Toman
100,000Rls (10,000 Toman) Sad Hezar Rial or Dah Hezar Toman or Dah Toman
500,000Rls (50,000 Toman) Punsad Hezar Rial or Panjah Hezar Toman
1,000,000Rls (100,000 Toman) Yek Miliun Rial or Sad Hezar Toman

Notes are usually available from banks rather than cash machines.
Less valuable moneys are smaller than a 1000 Toman which are usually(not always) coins :
5000 Rls (500 Toman) Panj Hezar Rial or Punsad Toman
2000 Rls (200 Toman) Do Hezar Rial or Divist Toman
1000 Rls (100Toman) Hezar Rial or Sad Toman
500 Rls (50 Toman) Punsad Rial or Panjah Toman
Some expat staying longer (usually over 6 months) may wish to open local bank accounts.
Banks are usually open Saturday to Thursday from 8-15.
Cash machines are found outside banks and metro stations. There are sometimes cash machines at petrol stations and inside shopping malls, but these ATMs only withdraw money. Cash machines doesn’t accept international bank cards.


Source: http://www.iran-rental.com (Expat services company in Tehran)