Lovely little apartment in an unbeatable location. Close to everything you want to do and see but quiet enough to get some sleep. The rooftop terrace is an oasis for then you just need to sit and read/sip wine/think deep thoughts about that fascinating city. The hosts made the entire process uncomplicated.
Probably not suitable for people with difficulty walking/climbing stairs as the building has a narrow and steep staircase. But the apartment has everything one needs for a weeklong (or longer) stay: cooking equipment, laundry, lots of guidebooks to direct you to some less overrun sights, and several convenience/grocery stores nearby. Walking distance to most major sights and just across the bridge from all the fun of Trastevere.
Highly recommended.