Hey all, I'm totally new to the community, and even though this discussion looks old, I want to contribute in any way I can, so I'm going to add my two cents as a history major in college...
Basically, wlister is dead on with lots of what he says. Most dwellings (even in "cities") in the middle ages were very primitive, utilizing dirt floors and whatever building materials were on hand. The buildings were usually single story/single room buildings, where the family lived/slept/cooked/etc on one end, and the other end was for animals or working. Not as flashy as the Tudor-style buildings.
Larger cities started sprouting up after around 1100, and some buildings here were made of tougher stuff, and could add a second story -- usually the top story for family life and the first floor for a shop of some sort.
Most windows were basically holes in the wall that could be covered, as glass was not readily available, as already stated by Legomaat.
All in all, the typical medieval house wasn't that exciting to look at. If you're going for some historical accuracy, try it out and I hope this post helps you out a bit, but otherwise I'd follow g2's advice and go for what looks interesting.