Go down the stairs and take a right and stop in the hallway before you are under the star chandelier.
Move down the stairs and make a sharp right, turning right at the first available opportunity to continue in that direction, through the marbled opening to the next room. Move down that short hallway and stop at the edge of the circular room there.
Continue down the stairs. You'll see a big starburst tile on the floor, turn right and go into the first doorway on the right. There will be a big mirror in the room. You'll stop and wait just inside this room.