First and foremost, the location is absolutely perfect. On our second trip to Rome, we wanted to be close to Trastevere without being right in the middle of the late-night noise, and close to some client work I had in Camp de Fiore.
My wife frequently did her artwork up on the terrace, which looks out to the river and Ponte Sisto, and down into a private garden on the other side. We enjoyed a magical dinner up there one night and drank too much vino (which we got at the nearby organic store, Natura Si).
This apartment has a lot of nice touches, the bathroom is really great, and it's a real benefit to have a washer. The internet was not so great - at it's best, it was 10MB down, under 1MB up. So it was at times challenging to do work. I think this is quite typical of Rome.
We highly recommend the Roscioli businesses nearby - Rimessa Roscioli for a fantastic wine and food tasting, Roscioli Caffe for a coffee and cornetto (croissant), Antico Forno for the best pizza anywhere and Salumeria Roscioli, where we fortunate to get lunch reservations.