you're on the stair case, get down the stair case. Now you can see a round table, a sofa on your left. Go near the sofa and you will find a narrow way beside it, go through that road. You will find a room where you can see a couch, a table and a mirror. Go along the couch, on the window take a right turn and go straight until you reach at the end of the couch and now you're at your destination where you are in between the glass door and the back side of the couch.