We had a great stay in Matteo appartement. It's extremely well located, you can see the Colosseo at the end of the street. It's really close to the transportation system, 5 minutes walk to the metro blue line and 10 minutes walk to the red line, and near some tramway and bus lines.
There's plenty of nice restaurant to eat around the flat.
As for the appartement, it's quite cosy and charming. It's clean and was renovated not so long ago. There's one bed on a mezzanine and one convertible sofa on the main room. The kitchen is well equipped so you can cook for yourself. The bathroom was nice and stocked with everything we needed (there was some towels and even a washing machine). The appartement is partially located in the basement, so it can lack a bit of light during the late hours of the day (it didn't really bother us). There's also the AC.
Matteo is such a nice host, he gave us some good recommendation for stuff to do around and was accommodating and helpful.
Couldn't recommend you more to book a stay in his apartment.