You would be able to access the room we did, but you would need others in your group that were tall (must manipulate things on the ceiling) and some that are slender (had to crawl through a small door)
I agree, the hosts there were very helpful, and I believe they would ensure you have a good experience. You should be able to navigate around the rooms well enough to have fun with it.
The ones I've been to yes you should be able to get around. Even the Grimm Tale at Stark Caverns should be wide enough on the boardwalk through the cave. Might check door measurements
To my recollection there were no steps. I would say it all depends on the width of the doors and your chair. If your chair fits through standard doors then I'd say you should be good.
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