We stayed for 4 nights and we very much enjoyed it.
You are in a good central location with short walking distance to great food and nightlife.
The apartment itself was clean and bed very comfortable. You have both a washer and dryer in the apartment which was very helpful since we packed light. There is also a safe to store your valuables.
Your hosts are wonderful people. Very strong communication - helpful in arranging transportation, identifying the best local eateries and making sure to respond quickly to any inquiries you have.
Getting to the apartment was simple from napoli centrale. Take just one train - 3 stops - and then a 3 minute walk. The taxi to the airport upon departure was inexpensive as well.
Highly recommend for your stay in Naples!!