Excellent place to stay in Naples. Away from the touristic area and you get to see how the locals live. I was a solo traveler and felt safe staying there.
Claudio was extremely communicative all through my stay. He was also kind enough to schedule a taxi for my early morning departure.
There is a small supermarket a short walk away and a pizzeria around the corner. The metro was a 10 mins walk from the flat.
As a previous comment mentioned, yes the street is busy and noisy but I was able to sleep comfortably as I was tired from the full days out. I suggest you bring very comfortable walking shoes.
Overall, I had a wonderful trip and I will definitely recommend this flat.