I can help with some real life questions if you want. To just spew out everything would take pages to posts. Our house was built in the mid to late 1800's, and it has an addition that is much newer.
It has wood stoves, 18" limestone walls, and while it has modern electrical, our knob and tube, and oil lamp systems are still intact in the attic, but only as vestigial technology. I have pine and cypress floors, no subfloor, piers are literally cypress stumps, windows are single hung with original glass that is wavy and beaded, and they rattle when the wind blows if you don't shim them with a business card and put a towel at the crack to you don't get too much draft. You really really have to get comfortable with saying "it's charming" and you need to accept imperfection, and make concessions on stuff. The best advice I ever got from the Alsatians restoration folks that restore them is "don't try to fix or level anything. It was not perfect when it was built, and you'll create bigger problems." A marble placed on any given square foot of flooring could roll in any direction depending on where it is.
Insurance is not any more expensive unless you have it registered as antique. Now, if you are in town, then you may have a whole other slew of things to deal with that I don't and I can't probably comment on that.
AC and heat run 24/7 during peak winter and peak summer times when my porch is 112. I do most all of my own work just because it's hard to find pros that know how to deal with old houses since they aren't built the same. The only thing I did not handle myself was repointing the entire house since the plaster was removed decades ago.
But no matter what, if you are coming from a slab and modern build, it will take some getting used to and if you are not comfortable being uncomfortable some times, then it may not be for you. My house stays at about 78-80 in the summer. But I will say, during snowmageddon, this place shined for a week without electricity. We like it but I'm handy and it's sustained our family's ranchers and farmers for over a century so I suppose we'll survive the same.
All of this said, there is a HUGE variation in old houses like these even if the same vintage, so, yours may not have any of this "charm". You'll need to decide for yourself.