Great location, in the heart of Trastevere and surrounded by beautiful buildings and amazing restaurants. The host was very kind and responded quickly to messages on AirBnB.
The location is a little far from a Metro station, so travelling to and from the airports would rely on you getting buses, or walking 20 mins to the nearest Metro (to then change at Termini). The location compared to all the other sites, were perfect, but a little out of the way if you don't like walking.
The door entering the building is as thick as a typical Roman door, so push hard! The apartment was stunning and beautiful. Ignore comments around 'smelling musty', I'm pretty sure that's just the smell of the wooden floors (which i liked!).
The only thing is that if you don't like sleeping in a warm environment, the upstairs bedroom can get quite warm, even with the windows open. We came in March and the temperature averaged 13 degrees.
During our stay, we had an issue with our toilet which meant that it wouldn't flush, or we'd have to sleep with the sound of running water. Our host was told about it (on the day before we left), however the issue wasn't resolved during our stay. Other than that, I would highly recommend this apartment to anyone considering Rome, however if you're coming in the summer, I'd ask for a fan!