The apartment is spectacular! I suspect one of the best views in Naples. We took a taxi from the port to the apartment and traffic was terrible. Would not recommend driving.
As other reviews mention, with no air con the apartment can be stuffy, fans and the breeze help, but there is still traffic noise and bugs to deal with when doors are open.
There are also no decent bars/pizzeria/restaurants near by, but an excellent Carrefour so we ate in at nights.
Easy to get down to via Toledo either by stairs or the funicular. Did not attempt to walk back up the stairs.
Naples itself had a few gems, but it is very dirty with extraordinary amount of rubbish in the streets when off the main tourist thoroughfares. If coming to the area again I would base myself in Sorrento and do day trips from there.