Lilly is a great host, very responsive to our needs. She gave us all the right directions to reach her apartment easily. She also provided us with a city map and gave us of few tips regarding the best visiting routes. The apartment is located in a quiet neighborhood with plenty of shops, markets and places to eat quality food at reasonable prices. We traveled in a group of six and in this context the two rooms (the living and the bedroom) seem a little bit small, but we were mostly out visiting so it wasn't that much of problem. I think the apartment can be enjoyed to the fullest for a group of maximum four people.
Regarding the city center accessibility, the tram station is just one minute away and gets you directly to Piazza Venezia in aprox 15 min. The are also nearby bus stations for Vatican. A very nice and big park is just a 10-15 min stroll away from the apartment.

All in all, our trip to Rome was a positive experience and we thank Lilly for having us into her apartment :)