Cabin 644 was excellent. Very quiet despite being bellow an open veranda hallway that's the "balcony" of the lanai staterooms upstairs but can be publicly accessed. It was close to the stairs and elevators that took you right to the dining room and the lido buffet without being too close to have any noise from it.
The room was nice with a sofa bed and a small tub in the bathroom. Window is very nice and large too with perfect views. Highly recommended room. Also, since it's on the bottoms floors and close to the center of the ship the rocking of the ship was less noticeable than in other areas of the ship.