This is a nice place in southern Trastevere, bus 170 runs from central places in Rome to the door. Also metro station Marconi is close by. Or you could grab several different buses to Trastevere Railway station, and then change to tram 8, which runs to Piazza Venezia. The area is charming, with a good Simpy supermarket very close by. Also a great Gelateria next door, and we very much liked the Retro restaurant (10 meters on the other side of the street). It's possible to dine outside in the small garden area in front of the appartment. The appartement it self is fine, a bit of ventilation cleared the moist inside.
Cristina is a very kind and helpful host. We arrived rather late at the airport, and Cristina picked us up, for a reasonable fee. It was great not to have to worry about how precisely to get there and get keys etc. Also, she drove us a bit around in the area, showing various key points. We recommend!