Do not stay on deck 2. the noise from the engines are awful , lots of banging all night. deck 3, middle of ship is best.
Ah, same people who asked about early or late dining above. Regards cabin, go as far forward and as high as possible to avoid vibration and engine noise back aft. Now I know what ship you are planning, second sitting is preferential as this ship has late sailings on a number of days, giving you extra time ashore if needed. They also clear the show lounge between sittings, so no problem there either. I wish you luck.