If you have a residence suite, you shouldn’t have to worry about the location of the laundry room since laundry, dry-cleaning and ironing are all included in the price of your cruise. If you have a penthouse suite, you’ll receive 1 bag of laundry per person during the cruise. Lastly, if you have a standard suite you get 1 bag of laundry per suite during your cruise. Hopefully, this will help a little.
I agree with you in that there should be a laundry room on all decks with suites.