Valeria's place is lovely. Clean, well located, and stylish--it is really everything you could want from an Airbnb. It is a shared space, but we barely saw any other guests in the apartment, and the shared bathroom was no issue. Valeria was a wonderful host, and arranged for us to be let into the apartment early so we could nap before heading out to explore Rome.
Unfortunately (and this is out of the host's control), you can hear everything from the upstairs apartment. Granted, the neighbors were quiet when it was time for sleep, but it was difficult to spend time relaxing in the apartment during the day, as they have a child who was screaming/singing all day long.
If you aren't bothered by noise, or if you don't plan on spending time in the apartment during the day, this would be a great pick. However, we were disappointed that everything about the place was perfect, except for the noise.