Go up the stairs on your left. Go into the third door starting from the left and wait by the bathroom sink.
Walk up the staircase, following it to the right until you reach the top. Walk into the doorway of the bathroom that will be straight ahead and slightly on your right.
Turn right and walk up the stairs until you reach a landing. Turn right and walk up the stairs until you reach the next landing. Turn right and continue up the stairs. At the top of the stairs walk straight ahead into the bathroom door.