It was our first experience with Airbnb and it was great. Paola and her daughter welcomed us very warmly. They did everything to make us feel at ease. They are very very kind.
Regarding the flat, it's very well placed. We spent 3 days in Rome only walking. Don't forget that the flat is near the Vaticant which can be a true asset. Roomy (until 4 persons) and clean, the flat is very comfortable.
The flat is located at the terminus of a tram line. You might hear it during the day, but it doesn't work at night.

As far as I'm concerned, I could come back anytimes.