A micro-kitchen, bathroom, sleeping loft, sitting room… I think if we had an acre or two of land out in the middle of nowhere, one of these might be a nice addition.
Oh, and you can stay in one of those, too: https://www.airbnb.com/rooms/938257?af=1726391&c=direct_link
200 Sq. Ft. Pink Tiny Home in Portland, OR | Tiny House Pins