Flats
postitaja Nicola Brune sees Rome foorum
Wanted in Rome and of course live in Rome are also good websites for flats etc.
In Italy you pay less if you do a flat share (i.e. sleeping in the same room as two or three others) but I couldn't be bothered and got my own room.
The only problem with that is the price - 400 - 500 euros still goodluck.