The usual way is to consult the estate agencies (agenzie immobiliari). Expect to pay a global fee (agency + solicitor - notaio) of 10%.
Most of the agencies can also arrange mortgage (mutuo) for free but you might prefer to go directly to a bank. It's also mandatory to subscribe an insurance for the building.
Residents in Italy can get good rates and tax discount when buying their 1st house.
As an example, a studio (30 sqm) can be sold for 120 000€ and a 1 bedroom might be 180 000€.
http://www.attico.it will give you prices per sqm in all areas.