The apartment is in a wonderful, old building with loads of character. The location is great. There are lots of great restaurants, gelaterias, coffee shops and more within a couple of blocks.
We are a family of 4 (my wife, me and our 2 adult daughters). We didn't have a problem with any outside noise. Yes, the piano bar next door did have a sing-along of "Volare" too many times, but it wasn't offensive. There were nightly pickups of trash and bottles that did create noise but, again, not offensive. You have to expect some of this when living in a historic district with a mix of commercial & residential.
There are, however, a few things that other potential guests should know about. First, the place is adequately furnished, but is a little stark and not cozy comfortable. Second, I could never stay there in a hotter month since the air conditioning couldn't keep up with warm October weather. I can't imagine how it would be in August. Third, there are no screens on the windows (which is typical), so mosquitoes might be a problem. Fourth, the beds in the 2nd bedroom are two very small singles--I repeat: very small. Our taller daughter moved out to the day bed in the front hall area.
Overall, I enjoyed our stay. The location is wonderful and it felt right to stay in a home that is hundreds of years old in Centro Storico of the Eternal City.