Very nice staying in this flat, at the 4th and last floor of the building (with an elevator, only half floor to climb to reach it and another half to reach the flat).
Cristian is very welcoming and gave us many touristic information about the city ! Everything needed is present in the flat. It is warm in the summer because under the roof, but we have seen a air-conditioner - we did not try it although, because we can let open the door on the terrace (Naples is a bit noisy at night but it is ok). No shutter, but not a problem for us as we like being awaken with the sun.
Very easy communication with Cristian (using Whatsapp) and he was very kind to keep our luggage in his other BnB on the last day. Thank you Cristian !
The area of the flat is not the best to go out at night as not many things to do, but it is close to the station and the historical quarter, which is convenient.