Simona's apartment was a really good place for us to be based during a seven week long work trip in Rome. Trastevere is a great area to stay in and this apartment building is particularly quiet (you could never hear the busy Sunday markets going on just a block away). With the tram and bus lines you are away from the busy action, but whatever you want is still easily accessible.
The apartment itself is very large. We appreciated the air conditioning since we were staying over the summer, but were pleasantly surprised to find out how cool the apartment stayed during the day. This apartment is on the ground floor of the building and has a lot of shade. Some other bonuses: the second half bath, excellent wifi, and the washing machine in the private courtyard were great perks.
Simona was very kind and professional, although we never met her she would always respond very quickly to us on AirBnB.