I would invite potential guests to read the reviews below. I based myself on these before making my decision and they represent quite accurately the living conditions (very spacious, clean, close to the tram, walking distance from the center of Trastevere, beautiful apartment, etc) and the tremendous hospitality that you will surely receive from the hosts.
I would write more... but I feel everything has been said already...
We enjoyed our time there and I would recommend the apartment, especially if you are coming with family.
Merci encore une fois Annalisa/Flamania!