My review for this flat may be a little biased because we just didn't really enjoy Naples (we found it a little too chaotic and not well-kept). Plus we had a car, so driving up halfway up the hill to this flat every time we returned from visiting another city was just harrowing (the Naples streets are tiny, hilly, hazardous, and nerve-racking to drive on).
So now that you know my bias, here's what I thought of the flat: it was mostly fine. The view was incredible. I mentioned that it's halfway up the hill and the view of the Naples harbor and Capri are just stunning. We spent an inordinate amount on the balcony just staring at the view.
The flat is comfortable, has everything you need, including a washer (which we very much appreciated). There was an issue with the shower drain, but Valerio promised to take a look at it.
The super, Vincenzo, was the one who let us in, and also drove us to the airport. He's hilarious and very helpful, he gave us a bunch of food suggestions. Valerio was also very helpful, likewise sending me a bunch of recommendations and they were all spot-on.
To summarize: liked the flat, LOVED the view, but had issues with Naples itself. Next time, we'd probably stay in Sorrento, but it's really not this flat's fault.