Walk through the open door to the right of the boxes on the floor. Walk past the bathroom on the left. Walk down the stairs to the left. Wait on the area rug on the stair landing.
With the wall where the fireplace is behind you, exit the room going forward. After passing the bathroom on your left, you'll reach a staircase on your left that goes upwards and downwards. Take one flight of stairs going down, then stop on the landing.
Turn around and exit the room. Walk through the next doorway and then turn left. Walk down the stairs and stop on the platform with the white door.