Let's start with the positives. The area of Chiaia where the apartment block is situated and the block itself feel very safe, and the flat itself is quite quiet. It is convenient for the Amedeo Metro station, not far from the bay, and there are some good shops around, in particular the pasticceria next door and the bakery/cafe 16 Libbre across the road.
However there was no sense of a welcome, and although the flat must have been lovely once, many aspects of it look very tired now, especially the furnishings on the roof terrace e.g. the sun umbrella has clearly been broken several times, and cushions are stained and dirty. Also the TV buzzed horribly whenever it was on, there was no iron (which is listed), and there was no useful information provided.
In all, an excellent base if you plan to be out sightseeing in Naples all day, but less good if you plan to spend appreciable time around the flat.