My wife and I stayed here for 3 nights. The first and most important thing to say was the location was fantastic. Close to a great selection of restaurants (Toronello and Esseneza Wine Bar to name a few). It was also within easy walking distance from 2 tram stops that come from just outside the main train station of Trastevere so not far to go with luggage. Easy walking distance into both central Rome to see the sites of the Pantheon, Colloseum, Trevis Fountain etc and the Vatican City (25 min walk).
The apartment itself was clean and well presented with a comfortable bed and bathroom with a lovely shower (good water flow and temperature gauge). It also had plenty of pots, pans, cutlery and plates there for if you wanted to eat-in (we ate out every night - recommended!!). The street below, just outside the apartment, as described in other reviews, was full of life and came with its noise until the later hours however we had no trouble AT ALL sleeping as the bedroom had double glazing (I consider my wife to be a light sleeper).
The only thing I would warn of is the one flight of stairs you have to walk up and down to reach the first floor apartment. A little steep so take care and you won’t have any issues.