We did a tour of Italy for our delayed honeymoon/first anniversary and flew into Naples and stayed there for 2 nights.
Watch where you wander, I needed a walk the evening we arrived and we didn't want to go far from hotel and strayed into a more deprived area...it didn't bother me, but I suspect that is because I have travelled a lot more than DH,but he was super uncomfortable.
The biggest issue I took with Naples was the rip off taxi from airport to hotel, but as DH was not very well and in a bit of pain, it was easier than trying to get our heads around public transport.
The food was amazing, the people we met were friendly. There was a lot of building works going on to renew areas, this was May 2016, so would assume much has changed since we were there (hoping to go back next year and repeat the southern part of our holiday with DS).
As with any city, there is low level crime. I was warned about the Mafia still being active (not sure how true it was, but made for great pastime sat in the sunshine with local wine playing spot the Mafia 😂)
The biggest cultural difference we found was that the man is still expected to pay - I actually was carrying the money to begin with, and would ask for the bill as DH didn't speak Italian, but when it came it would be given to him, and he was looked to to pay.
Enjoy your break (I am very jealous) x