My girlfriend and I stayed in Giulio's apartment for 5 nights.
The location is excellent: situated in the bustling area of Trastevere, but tucked away on a quiet street far from any real noise. It's also within walking distance to many of Rome's big tourist spots.
The apartment itself is in an old building but has a clean, modern interior. It's quite small but we had expected that given the location and price point. It kept very cool at all times, which afforded us a welcome reprieve from the Roman Summer outside!
I would highly recommend anyone to stay here, especially anyone who wants to stay close to the action.