I have not stayed on the 4th floor or used the laundry but I do know that the smoking rooms are on this floor. They are mainly in the wing that juts out toward Epcot.
They don't have W/D in the studios? I thought they were supposed to be home-away-from-home. I was thinking of renting points from a DVC member for a studio and fully expected that I would be washing towels with the W/D in the studio but not expecting to be waiting around a laundry room. I think I may change my mind.
The studios do not have a washer and dryer-all of the other villas (1 BR, 2 BR, etc.) do. The studio is basically a regular room with a *very* small kitchenette area.