Value for the money is great . We were only here for a night and walked from the flat to the harbor. It was a great way to see all of Naples (if you don't mind a lot of stairs) . There is a parking garage up the hill past the Fiat dealer that was helpful in parking (about a 10 min walk). The view from the top of the hill is amazing.
I do suggest bringing a flashlight if you plan on walking through naples after dark as a lot of the streets are not lit.