My wife and I enjoyed our stay at Ascenza's flat and would stay again. The neighborhood is outside the core of Rome, but with easy access to two tram lines (~5 min walk), a metro, and multiple buses. We walked to Termini station in about 30 min, and to the Forum in about 40 min. Several restaurants, fruit and vegetable stands, and a supermarket are within 5 minutes. This is definitely a residential neighborhood, not a touristic one, which we enjoyed.
The flat shares an entryway and stairway with Ascenza's home. Inside, we found a kitchen with everything we needed for cooking, a comfortable bed, and a large bathroom with a great shower. The terrace was a fantastic place to sit or eat, and we used it nearly every morning and evening. While there wasn't a dedicated workspace, the Wifi was great (I measured 56MB down, 20MB up one morning), plenty fast for video calls or streaming.
There is air conditioning in the living room and an additional air conditioner in the bedroom. The units were very quiet and worked very well, so we were comfortable day and night although daytime temperatures reached 35C/95F during our stay.
The flat is generally very quiet, minus the typical noises of a neighborhood: a scooter passing under your window on occasion, neighbors talking, kids playing, that kind of thing. We slept well.
Ascenza was a very accomodating host, arranging for a taxi from the airport (our cost) and then rescheduling it and greeting us after midnight when our flight was delayed.
I noticed some old reviews talk about having 6 people stay in the flat. During our stay, there was only one bedroom and one couch and definitely not enough space for 6, so I suspect maybe the flat was remodeled since those reviews were written.