Calling ahead and requesting an accessible room is not enough. Experience has taught me that you must discuss your expectations and needs with a representative at the facility [not the world wide toll free number] and go through your list. For me, besides being able to get in the door, I need to know if they have an ADA or 'comfort height' toilet, grab bars around toilet and in shower, and a roll in shower. If that person doesn't know, find someone who does. Don't make your reservation until you are sure.
I have been researching accessible rooms in a resort town. I'm not sure if these folks know what the ADA is. My ADA has nothing to do with my teeth. Understand your needs and don't take for granted that anyone else does.