We stayed for 4 nights in mid december. The B&B had stunning views due to its location on the 8th floor. The pictures from the window are exactly as shown on this website. It was a flat with two bedrooms - a double and a twin. Though the bathroom was shared it happened that we never had to wait when we wanted it. The room was spacious and simple - it was also cleaned every day. There is also a fridge and kettle for our use.
Gianpaolo, the owner, could not have been a better host - before we arrived he replied promptly to our email questions and gave us his mobile phone number in case there were any problems. During our stay he recommended places to explore and restaurants to try out.
The closest station metro station was Re Di Roma which was 200 meters away. There is also a decent supermarket between the station and the B&B.
The only problem we had was finding the B&B on our first day - the sign is small and one could easily walk past it, but this was hardly a deal-breaker.
Overall highly recommended for your trip in Rome. Can safely say that the view will trump that of a hotel of similar price.
