You begin facing a wall, turn to your right and go towards the very tall bookshelf, then turn to your right again, you will see a set of open doors on the right, and then a single opened door on the left, you will see a staircase from that door, go towards the staircase, and then turn to your left, go down the hallway, and right before you enter the room at the end of the hallway, turn into the bathroom on the right, take 1 step inside and you're done.