Walk through the archway between the plant and the music instruments. Then walk through the double doors and make a left at the archway, and come to some stairs that are going down. Proceed down the stairs and stop when you get to the bottom.
Walk from living room to hall, turn left and go down stairs. Stop at the bottom of stairs looking at exercise room.
Walk through the doorway next to the saxophone and turn left. Go down the stairs and stop at the bottom of them.