i just came across this site, very usefull if you are looking for apartments or just a room in Holland. Its http://www.pararius.com
and you can even choose between 6 different languages
And for all you backpackers there is also the search option ''short stay''. Sometimes a better/cheaper option than a motel/hotel.
I found myself a nice shortstay appartent/villa in Amsterdam
for just the weekend, and i was wondering wether you find this site usefull too