We had a mid-ship ocean view cabin on deck 5 to minimize any motion if we encountered rough seas. the seas were mostly glass smooth in the Baltic. The cabin was very good, except we heard noise overhead from the walking corridor and especially from the Art Auction moving their stuff around using a "Cart" with a flat spot on one of the wheels.
For our next NCL cruise, we are moving to the same type cabin on the opposite side of the shop under one of the specialty restaurants to minimize the overhead noise. We think this will make it a very good location near both elevators at a good price point.