Hello rarecat, welcome to Cruise-Chat. Which ship are you sailing on? Are you in a E or D catagory, or in a suite? I've been in several aft cabins and didn't feel any vibration except for one time when we were at near full speed to make up time because of an emergency. The aft cabins have huge balconies, which is a big plus. The Radiance class ships are perfect, but the Voyager class ship have a 10% obstructed view because of the support beams.