The fireplace was my wife's dream, but I was totally onboard when she said it. My first thought was that it would be better to just have a gas log. But she was pretty insistent on having a real wood fireplace. She wants the crackling sounds and smells that you don't get from gas. The more I thought about it, the more I agreed she was right. It's more work, and you probably deal with more spiders. But it's probably a lot better experience.
As for the temps, you remind me of my oldest son. He doesn't live at home anymore, but he always kept his room about 55 degrees. We have to use space heaters and window air conditioners upstairs, so he was able to have his own temp zone. In the winter, he never used to want to use a heater at all. When it got sub-zero, we made him break it out, though.