We had a lovely stay at Giampiero & Giulio's place. Communication was great - they were always super prompt to reply and answer our questions. They let us check in early and Giampiero met us at the apartment.
The apartment was lovely - the bedroom is huge! It is in a little side street in the Monti district which is full of bars and restaurants - great for eating and having a drink. It is far away enough from that all to be quiet at night. It's also super easy to reach everything from there - the metro stations are close, however we never used them and walked everywhere. It's also 10 minutes away from Roma termini.
I would definitely come back!