Nice and big apartment, perfect for two couples as they can have almost independent spaces. Located right in the center of everything, all the places of interest are walking distance (more or less 25mn).
Trastervere is the perfect district to enjoy the busy Rome. Full or bars and restaurants + Cecilia gives a nice and useful list. That makes the apartment however a bit noisy in the evening until 2am, even with the windows closed. Be aware of it if you are a light sleeper, otherwise it's not a big issue.
The hot water can also be an issue for those who like to take long showers as there is only 17mn of hot water available.
Apart of that, the apartment was perfect and we would recommend it.