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Most of the cruise lines have cabins for disabled people and provided they are not all taken then one should be made available for you. The agents like cruise.co.uk would be they best way to assure you get the right kind of treatment. On board you will find lifts that will take you just about anywahere you want but I would suggest that you try to get a cabin in the middle of the ship so you have less distance to most facilities.
Enjoy Neil Down.