Upon our arrival, Piero met with us to show us around the apartment. He also patiently answered all our questions and suggested routes for some of the places that we wanted to go.
Although the apartment overlooks a busy street, it was quiet and we never noticed any noise from the outside. It's also just a short walk from the Vatican and a few bus stops so it's very easy to go around from.
The apartment was also very clean and spacious. It also had everything we need (washer, hair dryer, etc), even some maps of the city.
Overall, we had a great stay.