Loved Giulia's place; loved Giulia. Aside from being in a fantastic location (one of Rome's best), Giulia was so helpful with suggestions. I loved that. There are a billion places to eat and drink in Rome, but Giulia has a list of her favorites, and upon request, she'll further refine (she has great taste, by the way).
Two potential concerns were the noise in such a central place and the shared bathroom situation. My room was the closest to Campo di Fiori, and in fact, I could see the plaza from my window. As long as the window was closed, I never heard a sound from outside. I slept great every night. The bathroom was also not an issue. Just one other room occupied by a couple. One time I needed to wait to take a shower. I ran into them a couple of times, but the "common area" was small and not a place to spend much time.
Giulia turned on the air conditioning from 17:00 until midnight. It helped a lot and I was not in Rome during the hottest part of the season. During the day, I was out. If it were hotter, I might like to have air conditioning throughout the night.
Great option. Great host. Great location. Great time. Highly recommended.