Michela was a very good host during our stay. Communication was great and checking in and out was smooth and easy. The air conditioning went down right before we arrived (not surprising given the extreme heat in Rome leading up to our trip), but Mirta was very responsive in getting some fans and a portable AC unit set up for us.
The apartment was very unique and had lots of character. However it could have been cleaner, and there were aspects of the bathrooms and living space that that just made it a bit hard to be fully comfortable (lack of towel bars, limited seating with backrests, etc.).
The location was great in that we could walk to many parts of the city or easily catch a bus. The wonders of Trastevere are just outside the door. There is a piazza right outside the apartment and most nights there were loud musical performances until midnight where the sound was directed right at our windows. Needless to say it was quite loud, particularly with the windows open - which we needed to have open due to the AC issues.
All-in-all it was a very nice place to stay in a great location, but with some drawbacks.