The apartment is in a great location just off Piazza Navona. In the neighborhood you will find plenty of restaurants, cafes, bars and shops. The Piazza can be very busy and full of tourists, but just one block off the Piazza things calm down a bit. Be sure to get good directions to the entrance as it can be a challenge, especially at night. And if you have any mobility issues there are challenging steps up to the apartment.
In the apartment you'll find 4 comfortable bedrooms and 3 typical Italian bathrooms (small showers). The kitchen had the basics, and was fine for a 3 night stay where we only had breakfast in the apartment. But really there are so many great places to eat that are close cooking isn't a priority.
As others have mentioned the internet is spotty once you leave the living room.
Marco and his assistant were very responsive to questions. One of our traveling party left their passport behind and Marco found it and made arrangements to meet her at the train station to give it back. We really appreciated this.
The real question is would I stay here again, and the answer is yes.