I have to admit, I am one of the ones who likes the temperature freakishly cold. If my room is warmer than 65 degrees I can't sleep. We keep the apartment at 68-70, and I keep my bedroom window open, even throughout winter. I figure, we save money, and if you're cold you can always put on a sweater or a blanket, or take a hot shower. When you're too hot there's not much you can do about it.
That sounds just like me.
My comfort zone is in the low 60s. My girlfriend likes to keep her bedroom in the high 70s and still sleeps under thick blankets.
When we're together, we compromise and set the thermostat around 70.