The apartment is located really in the heart of the city. It's a walkable distance from every part of the city, close to Furnicolare, sea, some touristic streets. Yes, it can be loud, but this is the center of Napoli - nothing else should be expected and the walls and windows are so good, that if you close it you can barely hear any noise, it's very comfortable to sleep there. The apartment has I think everything you may need in a long and short stay there and is very atmosperic with some extra lights in. The apartment in general is really clean, the only thing that could be better is the cleanliness of the cabinets in the kitchen, but this was easily doable by myself in few minutes ;)
Vittoria was an excelent host - helped me find a spot for my car, when she knew I'm working remotely and I had small issue with the internet connection she made what she could to make it better (and it worked - the internet in bedroom was without any issues for a whole month), took care of my sheets and towels, was available. I'd recommed staying at this place.