I once lived with a guy who was a total slob, and wouldn't do any form of cleaning unless you asked repeatedly. Long story short that didn't last very long.
I'm not a clean freak, but I like to keep my place clean. I can't let dishes go for days unwashed or the floors go for weeks unswept. I hate the look of clutter and don't like being able to see dirt on floors/countertop/etc etc.