Go along the railing passed the stairs on your left and keep going straight until your in the middle of the hallway, then stop.
Turn away from the window and walk down the hall towards the staircase on your left. Continue walking past the staircase, and past the picture on your left. Stop when you are almost to the end of the set of long, narrow windows on your left, and before you get to the door on your right.
Take a right toward the staircase. Walk by the staircase and enter the corridor. Stop in the corridor before you reach the door on the right.