An absolutely perfect location for exploring Rome! Just a few minutes walk from St Peters, so you can get in before the crowds. Very quiet location, good kitchen amenities, and a comfortable bed. Excellent AC in the Roman summer!
Just to note, the nearby geography means that there's a hill between the apartment and the Tiber without any roads crossing it, and the main road nearest the apartment is not pedestrianized about 0.5 miles south of the apartment. Coming from the south or east of the city on foot it's easiest to walk to St Peters and then backtrack slightly.