Overall, it was a very pleasant stay. Maddalena was very quick at responding to messages and she gave us tips on where to eat in Napoli.
The apartment itself was very clean and centrally located.
One thing that bothered us was the fact that heating (we came in December) was only located in the bedroom and the rest of the apartment was quite cold.
Also, the listing does not mention that there is a "tourist tax" you need to pay once you arrive. Apparently this is something required by Italian law. So we ended up paying 2 euros/day/person.