Perfect location.
Many sights within a very short walk (5mins) - Pantheon, Trevi Fountain, Victor Immanuel II and Piazza Navona. 25 minute walk to the Colosseum and 30 minutes to the Vatican.
Studio apartmant is compact but has what you need for a city break. The windows at the front allow every sound from the courtyard to be heard but it it generally quiet at night.
Air conditioning unit is very weak. Even in october it was a little warm in the apartment.
Overall a nice place to stay and would return simply for the location.