We stayed in 6083, which is directly behind 6583, on our first cruise. We liked it so much that we requested it again for our second, but it was already booked and we ended up in 6085. That area of the ship is very quiet and very convenient to the mid-ship elevators, although we usually took the aft elevators because they were less crowded. We felt absolutely no motion in the room, although we were conscious of it once or twice in the restaurants.
Beth