Really lovely apartment, perfect location in the best district of Rome — Trastevere. I suppose it is even nicer in the summer (in january, it was little cold inside the appartment). The entrance is directly from the street. The apartment is large and well equipped, there is a little patio. I liked the books everywere, despite I don't read italian :)
The public transport stop is just a short distance away: the bus H goes to the Termini train station (to go to Florence, for example), the tram goes to Trastevere station (train from/to the airport).
It was easy to communicate with Marco before our arrival. At the place, we were welcomed by Marco's friend, Daniela. She didn't speak english, but she was also very nice.