I can only echo what other guests have written here already and that is that Roberta was very welcoming and provided us with lots of helpful information and concrete advice.
The flat is very beautiful and functional. It has everything needed for a short stay and, I think, for a longer stay as well. The beds are very comfortable. The area is nice, there are plenty of shops and restaurants nearby, as well as some nice architecture around. It is very well connected with buses and trams and it is possible to walk both to the historic center and to Termini station.
I recommend to everyone to visit a hidden gem which is less then 5 minutes walking distance from the flat, not listed in typical guidebooks, and that is Coppede quarter.
I would definitely choose to stay in this flat again on my next trip to Rome.