That would depend largely on where they were, and who owned them. Were they free farmers owning their own land in Scandinavia, or serfs in southern russia?
Generally pretty small buildings - just a few rooms for living in. Separate sleeping rooms were for the truly rich.
I generally think of indoors environmant as using a different scale than outdoors, perhaps 3' per square, in order to have rooms that one can manoeuver in.
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In other words; don't sweat it. Think about how you want the normal house to be, and stick to it so that the world feels consistent.