Can't imagine a better place to have stayed in Napoli. The apartment feels very spacious and has cozy furniture and tons of natural light (shutters if you prefer to sleep in). Also has a great little kitchen, modern bathroom and a washing machine. It's in a small residential building on a side street, so it makes for a very cozy respite from the crowds.
The location is a short walk from Napoli Centrale, so extremely convenient if you want to explore any point south along the Bay of Naples, and also a short (~20 min) walk to the Centro Storico and the waterfront.
Fabrizio was lightning-fast to respond to any questions and generous with suggestions about sights and places to see nearby. Would not hesitate to stay at Fabrizio's place again or recommend to a loved one.