According to the Disney Vacation Club website, it's a double-size sleeper sofa. I think that's the case with most of DVC's sleeper sofas in the studios -- just double/full size, not queen size.
I think the sleeper sofas in the 1-BR and 2-BR units are queen size.
The DVC website www.disneyvacationclub.com is helpful for this kind of info. If you select a resort and click on "Accommodations" you get descriptions of each room type. You can also get click on the room type and view the floor plan. You can also get a 360 degree view of each room type.