The engines are not in the back of the ship, they lie longitudinally along the center of the ship for a pretty good distance.
The "props" are close to the back, but are driven by large electric motors located well forward of the stern connected by long proppeller shafts. These shafts may be close to 175 feet long, so vibration from them could possibly noticed in the last 200' of the ship.
When in the aft restaurants, one can feel the vibrations from the props themselves pretty well, so I would expect the cabins there to hear it as well.