Cristina was a great and very helpful host, even going as far as letting me mail an important letter to the apartment that I needed for work. The location is ideal for visiting the Vatican, and easy access to the metro means getting around Rome is relatively painless. There is also a market and grocery stores in walking distance.
The room was actually a little bigger than the photos made me think, though it might be a squeeze for 2 people. Kitchen facilities are basic, but good enough for feeding yourself. There can be a lot of traffic noise, though it's reasonably quiet at night if you close the windows.