We spent 9 days in Rome. I'd say it's a tourist-dream-apartment.
10-15 min walk to Colosseum (other sights are very close too), 5 min to the tube, 15 min to train station, a lots of trattorias, bars, supermarkets, souvenir shops just in 2 min. Very quiet flat, the window goes to courtyard. 2 or 3 times we heard muffled accordion musik from outside in the evening. Street musician played for restaurants guests. But it didn't disturb - it was very nice.
There is everything you need in the apartment: comfortable beds, towels, air-conditioner, wi-fi. Kitchen is small and cozy, it's enough for 3 people.
Alessandro is a super host - answers all my questions very fast, met us in time, gave us useful tips and was everytime in touch.
I definitely recommend the apartment and the host if you'd like have unforgettable time in Rome.