We stayed in Cristina's B&B for 5 days. It was a pleasant stay, the room was airconditioned (Rome weather was very hot at the time) and close to Trastevere train station. If you plan to visit Rome just get the tram n.8 (direction Argentina) 5 mins walking from the B&B.
The breakfast was served in a nearby bar and it consists in coffee or cappuccino and brioche. Great!