We stayed here for a week and a half and were extremely happy with our choice! The bed is big and comfortable, the apartment (and shower) are clean and spacious, and the terrace is a wonderful luxury — huge and sunny, with a great view and a comfortable covered seating area for when the sun is too hot. Air conditioning is fantastic, even on hot days. Wi-Fi was fine; the router needed rebooting a couple of times, but Raffaello was very responsive with that.
In general, Raffaello was an impeccable host; he was very quick and helpful with communication throughout the process, and was specifically very generous and flexible with our check-in and check-out.
The building is very nice and well-maintained, in a quiet and nice block that is 4 minutes from the bus and tram, or 8 minutes walk from the core of Trastevere. It's really a great base for exploring Rome, since you can take buses into the city or walk to Trastavere for great food and ambiance, then come home to a quiet, safe block. There is also a cute pastry shop downstairs and a fantastic restaurant around the corner, for when you don't want to walk any further!
(One accessibility note: while the building does have an elevator, the apartment is only accessible via an additional flight of stairs from the top of the elevator. So, I would not call it accessible for people with mobility impairments. My husband is disabled but can climb stairs, so this was only a minor annoyance for us.)
If you're looking for a cool, spacious, comfortable, clean base to explore Trastevere and Rome, this is it. Thanks, Raffaello!