Massimo's is a very nice apartment, in a very nice and central part of Rome. It is literally a minute's walk from the Colosseum, and very accessible by foot to the historic centre, Caracalla's Terme, San Giovanni in Laterano, and many other famous spots.
The place itself is stylish and comfortable. The kitchen was very well equipped. We also found it very clean.
We stayed there for a week, two adults and two teens, and were very comfortable. Recommended.