The apartment is in an old part of town so the streets are narrow and cobbled with high buildings. Cars and taxis can't drive up to the door so you will have a short work of just a couple of minutes from where they drop you off. The location is quiet most of the time, just the odd burst of conversation from the street below and someone close by doing their (very pleasant) musical practice in the evenings, and it's in easy walking distance of Castel Sant'Angelo, the Vatican and Piazza Navona.
Andrea kindly organised a car to and from the airport, which made arrival and departure stress free, and was there to welcome us and show us around the apartment.
The apartment was a reasonable size and well equipped, the only weak point was the bathroom. The description does say it is small, and it is - a small bath, as you often see in Italy, with a shower head straight from the tap. A tall person might find it cramped and the water temperature fluctuated between hot and cold. Not enough of an issue to spoil our stay but, if it were my apartment, something that I would look at upgrading.
All in all, a nice apartment for a reasonable price for Rome and definitely one that we would use again.