This Paris apartment was 6ft by 19 ft. The designer took it as a challenge so that he could live in Paris. I love reading about how to make small spaces functional. Love it. I'm not super into this style of decorating but enjoy the ingenuity.
You can read about it here. http://www.nytimes.com/2011/06/02/garden/a-toehold-in-paris.html?_r=1