I used to instruct at Naples Air Center in Naples. Unfortunately, I have been out of there for four years. They are like every other flight school. Promises, promises, promises. They will get you what you want though.
I really can't recommend any since I haven't been there since last year. I flew a Cessna and an Aztec out of London but the instructor I flew with was a former student and only works part time these days. I have flown with an instructor named Paul at London but don't know much about his teaching technique since we were just flying the Aztec to Key West. I flew with him a few times when he was working on his certificates since he flew at our school. He is a great guy and very motivated. He is an MEI also. I don't know much about the other instructors. If you fly with Paul, tell him Mike sent you.