Here's how it looked when I got it
and here it is cleaned up a bit - the pressed cardboard roof is a little shinier now, but otherwise I didn't change anything on the exterior but wipe off the cobwebs.
This is the swinging out door - it had a lot of yellow crayon some child must have applied.
after:
And here's that great art deco scene on the first floor before and...
after!
To my incredible delight, what I thought was torn paper was actually just paper stuck on there! So with some delicate application of moisture and gentle nudging, I was able to remove all of it! There is, alas, a tear in the middle of the wall, but an amazing improvement overall.
I was also able to clean up the floor which also had the most enchanting wood grain you've ever seen...
Here's a sort of before and after that shows the difference. I cleaned with first a mixture of vinegar and water, then lemon and water, then... dare I say it... Magic Eraser which really did the trick. Of course you have to be very very careful. If you clean too much, you'll Magic Erase the whole damn thing.
After all that cleaning, I really didn't want to touch it very much, and since I wasn't able to find the exact house (although similar ones) online, I have to think it's pretty rare. I offered it back to my friend, and also mentioned we could donate it to a local history museum, and because she's super-cool, she wants to donate it. I couldn't be more pleased.