This place is a hidden gem in Naples. It is located in the oldest, most historical part of the city, and you just need about 15 minutes by feet to get to the Metro, which takes you to the center in 2 minutes. You will get the typical neapolitan feeling, as there are not many other tourists around, but it is great! The flat is located uphill, which can be a bit exhausting, because you have to walk quite a lot. Prepare for that!
Other than that the apartment is beautiful, equipped with everything you need, and owned by the best airbnb-host I ever met. I would highly recommend Alessandros place.