I really liked this flat in the center of the old city. The location is perfect and the flat was well furnished and comfortable for us The kitchen was well equipped, the beds were excellent and the host(s) very responsive whenever we needed them. It is a large family flat that the family now let out on AirBnb and has a more local vibe then some smaller 100% IKEA furnished pads we have seen in the past - we liked it!
Two small things to note, the keys to the downstairs doors require a but of getting used to but Matteo explained how to use them and all was well. Also we were there in winter and the control of the heating is outside the flat, eventually they just left it on in the evenings which is fine and if there was a problem we could have solved it with a phone call to the housekeeper (in an upstairs flat with the heating controls).
However these were minor problems and the flat was exellent - we would certainly want to take it again if we revisit Naples.