You're standing on one of the platforms of the stairs. Go down the stairs. Once you're at the bottom, you're going to walk towards this round dining table. Make a left from this archway - through this  archway - and into the one you see on the right. There will be a piano directly in front of you, a fireplace on the left, this semi-circular sofa or a couch and an entry table on the right. Walk in between the couch and the table towards the piano and stop right in the corner of the room on the left by the painting and the curtain. For reference, the painting's going to be on the right and the curtain's going to be on the left. You're done.