You'll like the aft balconies, they really are a lot more spacious and the view is absolutely fantastic. You may hear some engine noise but usually not too much, mainly just when leaving a port. And the back is one of the better places to be (other than the center) as far as movement. Ships are more balanced in the back because theres more ideal weight in the back, as in, theres more stuff back there. The front of the ship is the part that clips and cuts the waves and although there are fresh and saltwater ballasts in the front of the ship, it still bounces around more.