We stayed as a couple for 3 nights. Check -in and out were both easy and stress-free. The place is easy to find and right off the main street, but secluded enough that there's no city noise in what is a very busy area.
The apartment was super clean, with striking decor and a brilliant shower. Big, comfy bed and the apartment is kitted out with everything you'll need for your stay. It's furnishings are modern and contemporary. The toilet room has a glass door, so keep that in mind if you're shy!
Location-wise it was perfect. Right off one of the main streets in the historic centre of Napoli, within walking distance of the majority of the sights and transport links in the city.
The restaurants nearby have some of the best food and drink you'll have in your life. Sorbillo's is about 30 seconds away. There's also a supermarket on the same street as the apartment which was super convenient.
Napoli was the most interesting place I've ever visited!