We had a perfect stay at Simonetta's appartment. We were greated by her personally upon arrival and she explained and showed everything in the appartment.
The location is really central and you can walk to every point of interest in Napoli by feet. The location shown by Airbnb before booking is not exatly correct, it's a bit more north, but that makes it even more central! :)
We did not really use the kitchen since there are a lot of good restaurants nearby. For what we needed it, we didn't miss anything.