You begin facing a bedroom, look forward and you will see a open doorway that goes out into a stairwell, go through that doorway, once you're facing the railing, turn to your right and take a couple steps forward, moving past the circular tables, and enter the very last archway on the left, take 3 steps going through this archway, once you're standing right in front of a art piece that's in a glass case, you are done.