We recently had supper in the castle - when you go in the lobby area there is a set of 3 chimes that the hostess will strike with a sort of hammer and will say "Cinderella's Royal Table is now seating the Royal so and so family" - it is pretty neat. Then you go up a set of curved steps to the second floor.
There is a companion bathroom in the lobby on the ground floor. but once you go up the steps there are nicer mens and womens restrooms.
The restaurant does have windows looking out over fantasyland. And there are steps on the outside of the window. When we were inside eating, Captain Hook ran by the windows. It was funny. Hope you enjoy your meal there. We did. The food was good and we really enjoyed the convenience of a nice sit down dinner right there in the park.