Fantastic location, couldn't be better. You'll be right in the middle of all the best restaurants, street shopping, nightlife, historic center. This is the best location in Napoli.
The only issue was the fact that the apartment is on the 5th floor, so there are a lot of stairs to climb which was a problem with our luggage. Also there is a church bell literally right outside your window which is very loud in the early morning. As long as you keep this mind, you'll have a fantastic stay.