Mario's place is a studio room with a sweet design on the ground floor of a big building. We were met by Dario who was kind to us, recommended places around and explained of Rome city a bit.
There were many tourists coming in and out to this building so there was a consisting moving in the morning or day (at least when we were there). Expect some noise from the building and the back yard of the restaurant.
The place is good for a day or 2 but I think after that it's a bit small for 2 people.