Totally recommend this apartment!
I spent 6 days with my wife at Marco's apartment and it was great. First of all, apartment is really very spacious and bright, there can easily stay 4-6 people without feeling tightness. It is proper, and there is everything you may need in the kitchen.
Another great advantage is location! Apartment situates just in front of Vatican, and it takes just 1 min of walk to get to the Vatican place. Just next we found amazing few restaurants, where we always wanted to come back. Also, for us was very useful internet point close to the apartment, where we could print electronic tickets to museums. Not far we found supermarket and a lot of shops. Also, in 2 min walking there is a metro station, which gave us opportunity to go to other historical places. By the way, we came back from the Coliseum by foot, because Rome is an amazingly beautiful city and it brings pleasure to walk there.
We loved our stay in Rome and in Marco's apartment, Hope you will enjoy too.