This tiny but comfortable apartment is on the hill, in the rich Vomero district with huge mansions nearby, it feels pretty safe in this area of town. The nearest metro stop, restaurants, cocktail bars, cafes, clothing shops are in walking distance. There is a Carrefour supermarket close by, which is rather expensive, but is open 7/24.
You need to climb a lot of stairs to get here, and be attentive that the street really exists in reality, but unfortunately not on Google maps. If you are around, just keep looking.