Barb,
We were in 6620 on our cruise (a couple cabins forward, and starboard instead of port) and we loved it so much we tried to book it again. It's really nice and quiet in the aft. We never heard any noise from the elevator area. It's easy to get coffee in the AM.
We were lucky, on our eastern cruise, we were away from the dock in each port, but I've heard that varies by conditions.
GBG