Exit room, go down hallway and stop at the stairs.
Leave the room and walk out of the room. Take a right and walk down the hallway towards the stairwell. Stop on the third step from the bottom.
Proceed forward through the doorway that is to the right and towards the antechamber that leads to the hallway. Continue straight forwards through this antechamber and into the hallway with the tall and narrow windows. Turn left to walk down the hallway and pass the set of tall narrow windows. Proceed until you reach the area where the spiral stairway is. Turn right in order to go up the stairway. Go up exactly two steps and stop.