We usually book very near the laundry room. It's handy since we wash about twice a week. So far, there have been double doors into the laundry room, so there's no noise from the machines. They're usually also closed from 10 PM until 8 AM.
I'm with the other's on the restroom question. I've never seen one near a cabin , but I guess it's possible! What ship are you sailing?
"A truly happy person is one who can enjoy the scenery on a detour."