You will start by facing the window. Turn left and jump over to the other side of the couch. Turn left once again and walk towards the foot of the stairs. Don't go up. Turn right take a step forward. Turn left and jump the over dining table towards the right side corner of it. Once you're facing the doorway behind the dining table take a step inside. Turn left you will see an opening with a doorway on the right. Stand on that doorway and you're done.