Great stay and great host. Location is walking distance from everywhere pretty much - train station to Pompeii, Ferry to Capri (10-15 minutes) and the metro is like 5 minutes away, historical center about 10-15.
The apartment is extremely well equiped: full kitchen, pots, pans, Moka Pot, coffee, oil, etc... Just buy some groceries and you'll be all set. AC upstairs is perfect and strong, terrace is amazing and bathroom even has a washer! Each person gets three towels and everything felt clean!
Two things to consider: the apartment is 4th floor but it's a high 4th floor (more like 5-6th floor up the stai) and as you can see it is split into two so terrace and room are upstairs in the apartment where kitchen is downstairs.
Overall highly recommend this apartment, would come again if I return to Naples!