The location can't be beat. Close to excellent restaurants, bakeries, and small markets. Quickly walk to sights such as Piazza Navona, Trevi Fountain, the Pantheon, etc. It's a more ambitious walk to Villa Borghese or Vatican City, but very doable all the same.
What we liked best about this place was how easily we were able to jump out of the tourist fray and find ourselves someplace less crowded, and more enchanting like Trastevere's quieter neighborhoods.
The apartment itself was fantastic. Well finished, and clean. After a long day walking the streets, it felt great to come home, make one last final climb up the steps (four flights) and end the evening in peace and quiet atop Campo di Fiori.
We feel confident that we picked the perfect place to stay, and I'm sure you will feel the same.