Wow, what an incredibly charming flat! It is very spacious, and had plenty of room for our family to spread out to the different areas. The rooftop terrace is perfect for taking in the city life, and right next to the kitchen for prepping wine and cheese (or whatever) to enjoy in either the inside or outside dining areas. Some of the previous reviews have some criticisms - the stairs are steep, some of the mirrors are a bit silvered, things like that - but none of those were negatives for us, they just added to the charm. This really feels like it was someone's treasured home, full of their artful and thoughtful decorative touches, and living in it for a week was a wonderful slice of Roman life.
The location also cannot be beat. You are minutes from Navonna, Campo d'Fiori, Via di S. Pantaleo, food markets, ruins, etc., and yet the apartment itself is very quiet, with double windows. It's also a very easy 10 minute stroll to the heart of Trastevere, and all of the excellent restaurants there.
The host was great and very responsive, the furniture was comfortable, the kitchen was well kitted-out, the internet was strong and reliable (we had to work a bit while we were there) - I wish we had more than a week to enjoy it!