Hi, I don't see this cabin as handicap accessible. So i am not sure if you would need to use a wheelchair while in the actual cabin and bathroom/shower. In those situations a handicap or wheelchair accessible cabin is a must and you should contact the cruise line to have this arranged.
I'll probably have a slightly different list. I am an amputee without a prosthesis and reside in a two-story house (long story). The ability to use a wheelchair both upstairs and downstairs is my favorite feature. Since it doesn't go anyplace, I have a nice one below and an addict one above, which I can also use for transportation with https://www.bennyexpresstransportation.com/. I absolutely adore the grasp bars on my raised toilet seat. I also have a few pieces of wood that are the same size as my kitchen drawers, so I can pull one open, set the wood inside, and use it to eat, prepare meals, or use my computer. My chair easily fits beneath it because it has been pulled out.