I highly recommend Roberto’s place, it is right by the train station in Naples and a short walk to multiple supermarkets, restaurants and tabbachis, so you can find pretty much anything you could want easily.
The apartment itself is also a lovely space, really well designed and clean- but the best part for me was the spacious balcony/terrace which had amazing views of the city.
Roberto was also a really helpful host, waiting for me to get off my delayed train to give me the keys and recommending lots of things in Naples- if this apartment isn’t booked during your stay then make a point of staying here!