You are facing a door and a desk.  You are going to turn around and you are going to step into the hallway and make a left.  You are going to go down the hallway and you are going to turn into the room on your left right past the white type column on your left.  You are just going to step into the doorway of this room.  It will have a number above the keyhole that I believe says 340, it's an empty room and you are done.