No floorplan, otto, but I do know what an amazing job you can do with even a sketchy one! I do think it would help us understand the layout much better.
Here in NC, we have two types of multilevel houses: a split foyer, which has two distinct floors; the foyer has stairs going down, usually to the bedrooms & family room or garage, and the top floor which has the LR, DR, kitchen, possibly MBR or study. A split-level here has three levels. The foyer (mid-level) gives way to the LR, DR, kitchen. Go down a half-flight, and there is a family room with, often, an additional bedroom, workroom, office, etc. Go up a half flight from the mid-level, and it presents the bedrooms. These houses are usually built on lots that have an uneven layout, left to right, thereby making this type building very practical.