Overall, we had a nice experience and trip in Rome. Antonio is very friendly, helpful, reliable and always replies on time.
The biggest advantage of the flat is the location: in San Giovanni neighborhood, close to public transport: metro/ bus and walking distance to the Colosseum. Around the flat there are many shops, pubs, cafes, restaurants.
On the downside of it, it can really get noisy during night due to the main street and not so well isolated big windows. We had sometimes trouble to get used to it and have a peaceful sleep.
Moreover, we were a bit unlucky to be there during some cold winter days - due to the size of the flat, the heating system could not warm it up properly. But Antonio had provided an electric heater which helped a lot.
Overall, we recommend Antonio's flat.