Bring a pop-up laundry hamper to put in the closet to collect dirty clothes so they won't accumulate around the stateroom.
If you use the gym or the Rainforest Room, you can shower in the spa changing area, which can free up your stateroom bathroom a little.
The bathrooms have clotheslines built into the tub/shower area that you can pull out to extend over the tub/shower to hang dry bathing suits.
Utilize the space they give you. There is space under the bed for suitcases, space in the closets for clothes, shoes, laundry hampers, and additional bags. There are empty drawers and shelves: use them. There is a safe: keep your wallets and jewelry in there. The bathroom is bigger than for most cruise lines & has shelving. Keep the products you need to bring with you in there (
DCL already provides shampoo, conditioner, body wash & body lotion).
The biggest piece of advice I have is to not try to live out of your suitcase, even if it's a short cruise. You don't have room for that and it ruins the feel of the stateroom, anyway. Take an hour or two the first day to fully unpack (turn on a Disney on Demand movie for the kids if you need that to help you accomplish this) and put everything you brought with you into an organized location in a drawer, shelf, closet, etc. Then put your empty suitcases under the bed and leave them there until the end of the cruise.
Even a small stateroom can be pleasant if it's well-kept and organized. You provide the organization, and your stateroom host will clean it and make the bed twice a day. It will be nice.