"The good: very nice staff, very convenient to train station. We booked here because we had booked a Pompeii/Herculaneum tour and this was one of the hotels that the tour would pick up at. So our first goal was convenience, and this hotel did that very well.
The restaurant was pretty good - wonderful staff, good selection, we ended up eating there a couple of times. The breakfast had some vegan options which my partner appreciated.
Overall seemed clean, the room was decent size. Shout out to the common area artwork featuring hotel staff members.
The downsides: first, the shower was pretty awful. If it had just been adults it might've been ok, but with a small child this was really disappointing. It was like a folding booth that enclosed the shower area, did not seal fully along the bottom and the walls were not stable meaning if you bumped them even slightly (which was impossible not to do as it's about phone booth sized) the walls would sort of fold in on you and even more water got all over the place than previously due to the lack of seal. Created a huge mess even with adults being careful; with an uncoordinated child it was a bit of a water park situation and not in a good way.
The other issue was that the A/C in our room did not seem to be working and our room faced the square/train station. The noise outside is incredibly loud and there aren't really quiet hours - so opening the windows overnight wasn't really an option. Very much like being in a place like New York City in terms of the noise is just unending. The soundproofing was quite good, so if the A/C had been working this would not have been an issue. If we'd been staying longer I might have asked to change rooms but we were there only 2 nights and the second night was cooler fortunately, but I'd be wary of staying here in the summer.
Finally as you might expect given the noise, the traffic is bonkers out front and crossing the streets is pretty challenging. If you've traveled in or lived in a big city before you'll be fine, you just have to be confident about crossing, but this is another thing that was a bit challenging with a small kid and suitcases.
tl;dr the hotel was fine for a brief stay to visit Pompeii and Herculaneum with minimum effort required (easy to get to; easy to be picked up from; easy to get our train to Venice) but if I were coming back to Naples, particularly if I was returning with a child, I'd stay somewhere quieter and off the main drag, and with a better bathroom."