We play up in the girls' room a couple times a day. I find a change of scenery during the day is pretty essential, especially since it's so hard to get out of the house when it's still snowing and miserable (despite being mid-March). Mostly for my sanity, I keep the toys up in their room to a minimum. Right now, it's just dolls/house/cooking supplies (to go with the playhouse) and their books.
This is a little memory-foam bath mat (which we already had but weren't really using). This lives at the bottom of the ladder. Freya's been climbing up the ladder since we built the playhouse, and she figured out how to go down a couple months ago too. I'm amazed that we still haven't had a fall off the ladder, but I feel a little better knowing there's a cushion at the bottom.
Peek-a-boo! I also added some little curtains to the upper windows (from two mini tension rods and a set of brown embroidered place mats that I've probably had for five years and never used). How fanciful!
In the downstairs, there's a small room for the girls' doll cradle. It's tall enough for Freya to stand up in, but everyone else has to crawl.
And opposite that is the kitchen area.