In one word: Excellent!
Il Pinolo is located in the beautiful neighbourhood of Pigneto, where there are several restaurants, bars, pharmacy, etc. It's close to the city centre, just a 15 min ride on the subway. The appartment was clean, and had everything you could need for your stay.
Mauro is an excellent host. He's always available, and he makes sure you have everything you need.
If you are going to Rome, this is the best place to stay!