The apartment is beautiful, and exactly as pictured. The beds are extemely comfortable and the bathrooms and kitchen well-appointed (not that you will be cooking, you'll be out eating pasta). Check-in was exellent, Federico was communicative and found us as soon as we arrived and introduced us to the apartment and the welcome packages and amenities were terrific.
The location was very convenient for walking around Trastavere and across the river, we walked everywhere. Tons of restaurants nearby and an friendly bar / cafe inside the building right out the door (you can skip the pizza across street from the front door though).
The noise is real, and the wooden shutters don't make that much difference. We were there Thursday, Friday and Saturday night and the outdoor crowd was a huge party on all four sides of the building until quite late, then the seagulls come to eat the trash and eventually the trucks come to dump the bottles in the early morning. Ear plugs help, but you're really the middle of it all.
Overall, we really enjoyed staying here and the apartment was beautiful.