Natalia and Luigi provided everything we could need for our short stay in Trastevere. The area is really wonderful - so much to see and do, and Rome is a great city for walking around so we managed to see most of the sites on foot. They were also very patient - waiting for us when we were slightly delayed at check in and making the time to explain everything clearly.
As pictured, the second (mezzanine) bedroom is set behind the main bedroom so you need to pass through one bedroom to reach the other. This might be something to consider in terms of privacy (for example with two couples), but again might be an advantage if you are a family. There were three of us staying but the apartment could have comfortably slept another adult, or even two, although it was very warm! The main bedroom has an air conditioning unit and, although the second bedroom did not, it was easy to cool the two rooms before going to sleep because they are joined so this was not an issue.
All in all the building felt secure and quiet, the flat was clean, comfortable, modern and well equipped and the area vibrant and convenient for many other things. I would certainly recommend.