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Many cruise lines have disabled access cabins. Most would require you to be over 80% confined to a wheelchair to be eligible. However if you would just like to take a fold away chair on-board with you to make things a little easier in port then most cruise lines offer a storage facility or you can store it in your cabin. You will need to enquire about this at the time of booking your cruise as the availability for wheelchair cabins and the amount of foldaway chairs aloud on board is small.
The cabins on Ocean Village are a superb size do not know about any specail bathrooms you will have to ask. But I have seen many people in wheelchairs on different cruise ships and they all seem to have a fantastic time. Although as staed the biggest room we ahve been in so far is the Ocean Village, it is a not a luxurious ship but the locations it goes to are fantastic and the staff are always more than wiling to help even on and off tenders. Give them a ring and see what they can do for you then shop around for prices.
Hope you have a very relaxing time.