I stayed in 6090 last year (same basic location, except port instead of starboard), and I really liked it! The location is great, convenient access to both mid and aft elevators/stairs, but not too much foot traffic past the door.
6584 is only a couple doors down from the laundry room (located across the hall from 6588), which might make things a little noisy and humid occasionally. That would be my only concern.
Have a great cruise!