We spent four days at Alessia's with our four teenagers and had a wonderful time.
The flat is cozy and warm. One notices that this was the home of a lively family for a long time. The description of the webpage is very faithful to the actual flat. The flat is very well equipped and all the services are fine.
Alessia is a warm and attentive host. Communication was always great. She provides loads of information not only about the quarter but also about Rome, and offers help to arrange services to make our life easier (and gets nothing in return). She, for instance, helped us arrange the pick up from /dropp off service to the airport for a very good price and service.
Arguably, the house is not in the centre of the city, but it is walking distance to the Vatican and well connected with buses. Moreover, a taxi to the city centre, say Piazza Navona, is a short 10 min ride and less than 20 Euro, which more than compensates the much more expensive apartments one can find in the middle of town. Moreover, this way one has the opportunity to discover the no-touristy quarters of Rome, which is more like the real Rome, with local cafes, bars, restaurants and shops.
All and all, we strongly recommend Alessia's flat if you want to visit Rome, especially if you are a large-ish family like us.