I take it that you can get out of your chair and into your cabin if you are happy to have booked a normal cabin. You should have no problem parking your chair outside your cabin door. If it is too large for safety reasons in the passage, then the cabin steward will arrange for it to be parked for your. Suggest you contact RCCL asap on this question.
Hi just returned from the ship with my partners mother who also has a scooter , you have to provide the ship with the measurements etc but dont worry you can park your scooter outside your room , the corriders are much wider on this ship than any other i know , plus its really easy to get round its a great ship for people with wheelchairs and scooters so dont fret and enjoy yourself xx.