We stayed at Marco's flat for four nights and we enjoyed it very much. The flat is just around the corner from the Colosseo and tram/bus/metro, so you can reach attractions easily. The flat is very nice, clean and exactly as described, close to 24/7 market, nice restaurants and cafeterias in the area. Perfect when you want to stay in the city but still a bit away from the rush.
Marco was a great host, sending emails and messages prior to our arrival, he arranged for a nice, friendly driver to collect us from airport. Marco gave us great advice about beautiful Roma and also let us know during our stay that the Sistine Chapel was closing early on the day of our visit and proposed to go there early that we still had the chance to see it. I highly recommend this place and for sure would go a second time.