This is a wonderful, spacious apartment, close to public transit (30 meters from metro - just two stops from Termini, many buses and tram) as well as within walking distance of the Colosseum and St. Giovanni. Everything inside the house was clean, comfortable and in good working order. We had a two week-stay and did a lot of cooking and made plenty of use of the washing machine and drying rack. We could easily stay there for months. We loved the old built-in closets, and the recently redone rooms were also done well.
The neighborhood had a lot of families, which is not the case in most central rentals we've stayed at.
Andrea was a wonderful host. He was very communicative before we came, met us when we arrived, and responded promptly to the couple of requests we made during the stay. We'd very happily book from him again.
Our one word of caution is that there was a fair amount of noise at night. The apartment is close to a major intersection (convenient during the day!), and the small street it is on is used as a cut-through by cars. The noise level was not out of the ordinary for a central city location, but those looking for an especially quiet place would probably want a different neighborhood.