Ersilia's Apartment is just great. It contains everything you might need and more. The appartment is very clean and the location is great as well. You can reach the shopping street, convenience stores and metro by foot. You have to walk uphill to reach the appartment, which might be an issue for some people. It was not steep enough to bother me though.
Ersilia herself was a very helpful host. She gave me a lot of tips and pointers around Naples and replied very quickly whenever I had a question.
I can only recommend her appartment!