Spare room/craft room (or more accurate: my craft room with a bed so I never have to leave!) Article is actually about "thoughtful teenage bedrooms" but I see the room layouts as potential "studio-guest room combo.
This bookshelf wall is the dream of every bookworm. How else will you store all your books in your dream home or interior? I always love when bookshelves go over a doorpost and all the way to the ceiling.