We spent a week in Diegos apartment and enjoyed it. The apartment is small, relatively dark and the kitchen is not for advanced cooking. But it has 2 nice bedrooms, a fine bathroom and is situated quite perfect in central Rome near Castel St. Angelo.
The immediate neighbourhood is very quiet, but you can hear the neighbours in the evening, so be mindful of that if you're very sensitive with regards to noise.
Diego was a responsive and helpful host, who came to check on the dishwasher, that didn't work, and also arranged for our transport to the airport, when we were to leave.
If you want to explore Rome like we did, this is a perfect little flat.