We had a great time at Mattia's apartment -a very clean, spacious and modern flat with all facilities, including wi-fi and cable. the location is great, as two of the most important churches are at 10 minutes walk -Santa Maria Maggiore and San Giovanni in Laterano. There are also two metro stations on the line A at literally 5 minutes that connect you with the majority of the main sites in Rome, as well as easy connections with trams and buses. The Coloseum is only 15-20 minutes walk, which we did several times while staying there.
Mattia is also a wonderful host, he helped us with so many things: helping my parents with thier bags when we arrive, suggesting restaurants and things to do, booking a taxi to the airport in our last day and even bringing some delicious croissants for the road! There were some bottles of prosecco in the fridge but we didn't have them as my parents don't drink.
The neighborghood is relatively quiet and there are several good restaurants, cafes and convenient shops for any needs.
All in all, we had a terrific experience and would strongly recommend Mattia's place for someone looking to explore Rome without being in the middle of the tourist crowds!