We stayed two nights in this flat in the centro historico. I found it good value. Maica met us on arrival and showed us around, and was very friendly and helpful.
The entrance is up a small dark alley and the area is very 'authentic' - like most of the centre of Naples and the quartier espagnol, and not for everyone, but we had no trouble and liked the activity and noise. The flat itself feels very secure indeed.
The flat is very comfortable, with a large terrace with plants, good shower, good kitchen, plenty of space.
The double bed is two single mattresses together. There is no wifi.
Otherwise a clean secure flat, with a wonderful terrace.