We stayed 4 nights in late July, Naples was incredibly hot. As mentioned in other reviews, the location of the apartment is ideally placed in the old town. It is nice and as described, the terrace is nice as it has some natural shade in the afternoon in addition to the brolly.
Check in and communication with the host was great.
The initial entrance to the building complex can be a little off putting as it looks quite run down but is actually very normal for the old town.
The 120 steps are probably the only issue, given the heat and humidity we limited going up and down them to twice a day! But that may just be because we are getting old!
Overall a good stay and a good apartment.