We only stayed here for one night; this hotel is perfect for a stop-over, actually better than that since it lives up to its reputation of belonging to the leading hotels of the world. The service is very efficient and friendly. The location is perfect, since it is across from the castle and the water, plus it is on the strip that everyone strolls on, yet not right in there that it is too loud. It is also across from many restaurants, many tasty local restaurants. Our favourite was Ristorante Pizzeria la Scialuppa. Excellent atmosphere and food, actually the best pizza we tasted in all of Italy. Naples is not known for the birthplace of pizza for nothing!
Back to the hotel, compared to the other five-stars I stayed in during our Italy/Greece trip, it doesn't stand out as much, but I had no complaints while I was there. I doubt you will too.