Well, I will now cross Switzerland off the list of lands that I would happily consider moving to. I am actually relatively tidy for a student and keep my things more organized than most (I have catalogued the entirety of my 1600 book library using the Dewey decimal system, with stickers on the spines). I vacuum my room relatively regularly, make my bed every morning, file my documents, generally keep kitchen surfaces clean and free of dishes to be washed up. The orderliness or disorderliness of my surroundings has a considerable effect on my state of mind and in my case keeping my room tidy is part of the task of keeping my mind tidy. However, there are levels of cleanliness that seem to be more obsessive than commonsensical.
Update: In support of clutter [HT: BHT]. Not quite my philosophy. However, as my library expands past its current size — I already have books piled up in my wardrobe, double-banked at the bottom of my tallboy, in piles on top of free surfaces and in boxes in the attic and under my bed — I may need to make my peace with mess (the alternative, getting rid of some of my library, being utterly unthinkable).