I was in a category D1 ocean view balcony cabin on deck 11 of the Oasis of the Seas. It is definitely smaller than other balcony rooms on the Voyager class ships but the balcony seemed to be slightly larger. The bathroom is typical size and very serviceable for cruise ship life. The beds are very comfortable compared to other cruises. closet seemed to be smaller but we have never needed all the closet space on a cruise, so good there. Not noisy but when neighboring cabins opened their closet doors it seemed to be very loud, but no other noises from cabin to cabin.
Overall great quality and very livable for a week on cruise ship in the Caribbean