I stayed here for almost a week with my younger brother, and we had an amazing stay in Rome.
The location of the apartment is between Piazza Venezia and the Colosseum (about 7 minutes walk from each one). Transportation inside Rome was so easy because of the central location, we didn't need to think about "when to leave" at any moment. We just went out of the apartment , opened google maps and got quickly to our desired location.
The place was clean, and had all the facilities needed for a visit, from a kitchen to a washing machine.
If you are looking for a location to stay at in Rome, choosing Gualtiero's place would be an excellent choice.