Update: We went on Carnival Conquest with our son. There were 4 of us in the room..... twin bed, rented hospital bed, sofa and overhead bunk. We had plenty of space in our room. The room was larger than RCCL and about the same size as Disney. We had the room at the front of the ship on deck 4 overlooking the secret deck. Loved it. Yes he could access the secret deck. There was a lip going thru the door to the deck but his wheelchair went over it. We placed his bed sideways in front of the window so he had a perfect view while in bed. Next cruise we are going to go without renting the hospital bed. Mattresses are nicer on the cruise ships that I think my son can handle it with a wedge.