I like unusual floor plans, like multi-level, or houses with a sunken room, or with a loft. I grew up in a house with a loft- they are really common in places where winters are very cold and wood heat is used a lot- the sleeping area is built to take advantage of the fact that heat rises.
My house now is a traditional 3 story Victorian, and my grow is on the 3rd floor... hahaha lots of carrying things up and down the stairs!
But my dream house is a chalet-style log home with a big deck, a giant stone fireplace, and of course the upstairs set up as a loft, leaving the living room open up to the roof.