Walk to the stairs. Go down the stairs to the next floor. Walk towards the ship painting. Go into the door on your left and wait there.
With the books on your right, walk straight and go down the stairs going down. At the bottom of the stairs, turn left and walk into a bigger area. Go through the door on the left side of the purple painting with a ship. Go through the door and stop in front of the sink.
Walk straight ahead and go down the steps in front of you, turn and go all the way to the bottom. Once you reach the bottom, turn left. Enter the door to the far right and stop.