We stayed two weeks in this flat. Everything went well. It is conveniently located (quite close to the train station and Piazzale Roma, and close to a bakery, a supermarket, cheep bars, etc).
The flat is at the 1rst floor (i.e. above the ground floor). The street is quiet at night. For late risers, you may be awaken in the morning by people chatting in the street, as the windows are single layered; but it's really not that bad.
Also, if like me you're wondering whether there is a window in the room: yes there is.
So good airbnb, I would recommend it.