I stayed at Fabrizo's place for four days with a friend. The apartment is perfect for two or three people, it's exactly the same as on the pictures and, even though it's not in the city center, it's very easy to get there using public transport (i recommend taking the bus 46 and then metro line A at Battistini, it won't take more than 30-40 minutes).
Fabrizio is a great host, he met all of our needs and we couldn't be more satisfied. We didn't get to meet him in person, since he was out of town when we checked in, but his son Jonathan was there to explain everything.
All in all, this place is great value for money and I would recommend it to all budget travelers.