Communication was great and fluid with both hosts.
We were late to the check in time due to extraordinary problems with trains (there was a strike), but they were kind to wait for us with the apartment fresh and with some cold drinks and some snacks.
The apartment itself is nicely decorated and well equipped. The location is great and at walking distance from the highlights of the city, and for the places further away you're 10 minutes away from the subway station.
Would definetely recommend these hosts and this apartment to anybody going to Naples.