St Peter House Station is the perfect location. Walk to St Peter Square in minutes.
It's advertised as 2 bedrooms, however, the living room space has a door & can easily convert into a 3rd bedroom. It was 3 of us and we each had our own room(and TV).
The apartment is immaculate and Davide is excellent host. He greeted us and was extremely helpful. I did a tour of italy (Venice to Sicily) and this was definitely the best Airbnb I stayed at. If I return to Rome again, I wouldn't hesitate to stay here again.