If your room is one or two away from Room 7668, I highly recommend you move. whenever the ship (only the Fantasy) goes above 21knots, the frequency of the propulsion system is off and the vibration is miserable. It was so bad our towel animal would fall apart each night. It is only the 4 or 5 rooms around that aft staircase that have issues. We had the chief engineer and hotel manager in our room and they explained it was a flaw that they had since they took ownership of the ship. They try to avoid going that fast at night, but on the long stretches and if wind is against the ship, they have no choice. They gave us sleeping rooms in the front of the ship, so we could sleep at night.
George