We were in rooms 8223 and 8225 this past week and if you stood at the window and looked left, you could see the castle and the fireworks show. Granted, you couldn't see the projections on the castle and it's not exactly a "castle" view because you're really looking right out on the parking lot, but standing correctly at the window, you could see the castle.
Just as a point of reference, if you're looking at the front of HNY's entrance to the lobby, 8223 and 8225 would be to the left all the way at the top.