I stayed at Mario's Trastevere studio with my partner for a long weekend in January. We had a wonderful time. The location in Trastevere is central to many restaurants and historical sites, but maintains a quiet atmosphere on the top floor of a more secluded street. The terrace was beautiful and a perfect place to relax after taking in the sights.
I would definitely stay at this location again in the future and recommend it to those interested in a cozy, central spot with great views of Trastevere.