You begin facing the corner of  wall. Turn all the way around and take a step towards the open entrance then turn left and take a step out into the hallway. Turn left again and walk all the way down the stairs and through the door in front of you. You're going to step into the doorframe that you can see in front of you to the left and then you're going to turn slightly to your right and you'll notice two paintings on the wall. Step just in front of those paintings, turn slightly to the left again and take one step forward. You should be standing just beside the window on your right and you can see an alcove with a decoration in it. You're done.