deck 5 cabins have the beds under the promenade deck 6. Usually not a problem unless there are very keen power walkers or runners (which is not allowed) at 6 am. I almost went out in my pyjamas to chew them out!
686 is quite far aft, so you get engine noise and thrusters when coming into port. Not a big problem, however, for people who like to know when we are getting into port.