It depends on a few things. The higher you are, the more private the balcony is. The lower ones are a bit larger, bot not very much. As you get further down(deckwise), the balconies jut out further from the ship, and are much less private than the upper deck balconies. We were on the Crown last July, and had a balcony on the Riviera deck. Our cabin was just under one of the pools, and we heard some noise from there, but it wasn't too annoying. We booked another cruise on her next year, and chose the Aloha deck. I feel that this should cut down on some of the noise, and the balconies are still very private. I hope this helps.
Also, welcome to CruiseCrazies.