SS Norway (12 times) '85 - '97; Radiance OS 06/01; Island Princess 11/04, Grand Princess 11/04/05, Golden Princess 7/21/06, Golden Princess 2/24/07, Explorer of the Seas 12/23/07, Island Princess 11/15/08
It looks like P218 is below the theater (but to the side). There may be some noise during the shows. I have read that the cabins are very well insulated, so it may not be a problem at all.
You're forward so you may feel more motion than amidships. You're also close to the laundry (if you want to do laundry on vacation ). You're also close to the forward elevators.
You may do more walking to go to the aft areas of the ship, but that's not always bad !
"A truly happy person is one who can enjoy the scenery on a detour."