Host responded quickly and professionally. Host also helped me to book a taxi to the airport (taxi came exactly as promised, taxi cost at 04:00 in the morning 35 eur). Apartment is very clean and nice. I didn't use the common room area (kitchen etc) since I stayed only for the night.
Location is very good: walking distance from the main train station of Napoli (trains to Sorrento, Salerno etc). Airport is also fairly close, but you need to take either taxi or city bus.
Overall would recommend.