The flat is beautiful and functional. We stayed 5 nights and really enjoyed it! The bed is very big, and comfortable ; the view on the small streets of Trastevere is charming ; there is an Italian coffee pot in the kitchen ; the music in the bathroom is a nice-to-have, too !
Domenico was very nice, and very accommodating with our arrival and departure hours !
Yes, the neighbourhood is quite lively, but it did not bother us, because it is the kind of place where we like to live. There are very nice restaurants and bars in the area, and less tourists than in the more central neighbourhoods, while still being close to a lot of touristic landmarks (we did almost everything by foot from there, but there is also a tram close by).
All in all, a great stay, would totally recommend staying there for a few days in Rome!