My wife and I had a great stay at Fabrizios place during our honeymoon. The location is very good, close to lots of wonderful restaurants and bars. Having said that, the exact location is very quiet and peaceful. Short 15-20 minute walk to all major tourist attractions in Rome.
The only inconvenient thing was that the elevator was broken when we stayed. We are traveling for 3 weeks and have tons of luggage, so it was not fun to carry it up 4 flights of stairs. There are a couple short ledges inside the apartment so be careful not to bump your head like I did!
Overall, we very much enjoyed staying at Fabrizios place and his terrace has great views of Rome. We would be happy to stay again during our next visit to Roma!