We stayed at Federicos place for two nights and it was a very nice experience. The rooms were super clean with modern bathrooms and location of the place is very good. It's with in walking distance of pretty much everything except perhaps the Vatican. It takes about 10-15 minutes to walk here from Termini station.

Federico himself was very helpful and provided us with lots of little advice for this and that. Definetly a place to go to if you visit Rome and don't know where you're staying the night. :)