New Orleans cottage house plan by FreeGreen. Two bathrooms in a space this size seems unnecessary. I'd turn the back one into a wic for each bedroom & put a tub/shower combo in the front one. Also less plumbing costs.
A small traditionally-styled Scottish house by modular builder The Wee House Company. This model has one bedroom in 431 sq ft. No upstairs, but definitely an idea if I can never quite afford an architect to design something specifically for me.