You will find a very comfortable and soundproof apartment! It’s small but it was enough for the four of us.
It's right in the middle of Piazza Umberto I which is a 5-minute walk to Piazza Garibaldi where’s the central station with train, subways, and buses. From there you can go everywhere! ;) also you have a supermarket there, the best choice to buy food if you want to cook home.
Naples is crowded and a bit dirty but is the city of Vesuvio and very close to Pompei so the experience will always be worth it! You can trust that.