We loved this apartment: it was very clean and spacious, the bed and couch were very comfortable, and most importantly, it was super quiet at night even though the streets all around Trastevere were packed with noisy people having a good time!
The neighbourhood was interesting and fun, with lots of great restaurants, but confusing to navigate. It is not the most central to the major sites, however—at least a 30 minute walk to most of them. But all the steps helped counter all the eating we did!