On the starboard side, cabins 11002-11022 are all under the hair salon, library, card room, amd photo studio. Three of those cabins, 11006, 11012, and 11018 are family suites. The rest are club balconies. I would highly recommend any of these cabins, as there is virtually no noise from above.
On the port side, 11500,11502,and 11504 are under the spa area. Recommended. Cabins 11506 to 11522 are under the fitness center. Not recommended. Someone running on a treadmill or dropping weights at six in the morning is not how I'd wish to be woken up!
The rest of deck eleven is a crapshoot. Some quiet, some not so. Depends on what area your cabin is under. Being under LaCucina is usually pretty quiet. Happy Sailing! And welcome to Cruise Critic!