We stayed a few doors down, room 8552 last February. Very nice room, we didn't feel crowded (only 3 people in our room though), split bath was great, the cat. 4 even has extra vanity space. We did hear the activity on deck 9, mostly the sound of running feet, it was even loud at times. However, it never interferred with anything - we all slept like rocks - gotta love that sea air!
Enjoy your trip!