Like the other reviews say, Rossana is an amazingly gracious host. She went out of her way to help us with some off-beat requests, and provided a very candid overview of Rome and where to go. Her English was fantastic and she was very understanding of our horrible (non-existent) Italian.
The room/bed was probably the most comfortable we had on our 13-day Italy vacation (TempurPedic mattress, I think). The B&B was very clean with enough space to do whatever you need. The kitchen and bathroom are a short walk down the hallway, and while you can't use the gas in the kitchen, this did not detract from the acceptability of the apartment.
The WiFi worked well in the morning and afternoon and seemed to cut out at night (perhaps due to increased traffic when everyone comes home?).
Location-wise, it was very nice to be near both Metro lines and the central bus terminal. The combo pass covering all public transit served us well.