We spent 5 nights in Alessandro's flat.
Alessandro is a very thoughtful host, met us outside of the cab when we arrived late at night, sent us recommendations for restaurants, kept our luggage when we were leaving, ordered the cab back to the airport. He's very easy to reach and fast to answer, and happy to help.
The apartment is exactly what you see in the pictures, very clean, comfortable, well heated, good shower pressure, even though I have to say that the shower cabin itself could be changed, rather small in a huge bathroom. The apartment is super quiet even though it is located a few minutes away from the Duomo and the very bustling streets of historical Naples.
The location is perfect : cafe, restaurants down the street, regular supermarkets, metro within max 7 min walk
Note that even if there is an elevator, there is still need to walk down several steps.