I guess I'd say - go for it, life is short - but pick your battles and keep your perspective about what's really important. i sometimes think it's easier to become a couple or move in with someone when you're younger and you really don't have a set routine or a set organizational scheme...

I've just listened to a friend rant for 2 days after she flew cross country to spend 5 days with a guy (they're all in love and the rest of that)... She felt very uncomfortable and unwanted in his apartment/space because he had a rule that the toilet seat lid had to be down, chided her everytime she forgot & kept a running percentage of her success rate, was upset she cooked eggs because he hated the smell (so wouldn't leave his bedroom till she'd cooked and eaten them and washed up), and was upset she drank milk. and would only watch certain tv shows after sunset with all the lights off, and other neurotic things. Her mp3 player couldn't be hooked to his stereo so he could listen to her music, because it would ruin the impedance. So - it was pretty obvious that he was completely not used to having anyone in his space... So... I would say, don't be that guy.