We are so happy we selected this place for our weeklong stay in Rome. The apartment is very spacious with a beautiful terrace - we had more than enough room for 3 adults and 2 children (ages 2 and 4). The kitchen is huge, and has everything you need for cooking at home, though there are many, many restaurants within steps of the apartment (I strongly recommend Osteria der Belli). A pharmacy is <1 minute away, and a sizable supermarket is a 5-10 minute walk.
All the sights of Rome are easily accessible on foot from this location. Campo de' Fiori is about 10 minutes, Piazza Navona 15, Trevi Fountain perhaps 25 minutes, Colosseum 30 minutes, Vatican 20 minutes - we had a very easy time getting around, even with a double stroller on the cobblestones. We were a bit worried about noise but there were no issues with this during our stay (except for the church bell across the square which rings on the quarter-hour).
Marzia is an exceptional host. She was very accessible both before and during our stay. She arranged transportation to and from the airport (highly recommended you do this).
Overall, we could not be happier with our choice - don't hesitate to book this place if you see it available.