I have traveled 8 times with Princess in the past few years, and the majority of those cruises have been on the Ocean or one of the other Sun Class ships. We have stayed in an aft suite (most commonly C749) every time and not had any problems with movement. There will always be more movement far forward or far aft on any ship that there is in the center of the ship, but it will not be enough to hinder your trip in any way. The most important factor in determining the amount of movement that is felt on a ship that size is the weather/sea conditions. April should not be too bad- beginging of rainy season in some parts of the Carribean, but not yet hurricane season. You may notice some vibration in that room, especially when the ship is just leaving port, but it is minor and you get used to it quick. Enjoy the trip!