As stated in the previous reviews the location in the heart of Trastevere is great, although it gets quite noisy at night, as there are many people on the streets and you can also hear everything that is going on in the hallway. So earplugs are recommended. The communication with Katia was very nice and without any problems. Unfortunately we had to wait around 3 hours upon our arrival in Rome before the apartment was ready (we arrived in the afternoon and informed the host about our estimated arrival time about a week early). It is in fact a little damp in the apartment, but with some airing and the AC it is acceptable.
As for the apartment itself, it is a nice and small apartment that is fine for a short stay when you're planning to spend most of the time outside. However, it does need some taking care of (some renovations in the bathroom are needed, some thorough cleaning in the kitchen...). We left the host some suggestions and hope that they will put some effort into it, as it has the potential to be a very nice apartment.