I just got back from crown princess yesturday, deck 15 is probably the busiest deck so it might be the loudest of all of them. If you won't mind being close to all the action and the noise though it is the most convenient probably but personally I would stay on 10. This was my first cruise and I am in love with this ship, have fun!!
If you get a chance to talk to CJ the DJ can you ask him his last name, I am trying to contact him, thanks and have fun!