Honestly it's not that bad if the building is made right. Especially old stone houses that also happen to be surrounded by trees are absolutely godly in these scenarios (the down side is the heating bill in the winter :P or rather that used to be the downside...). I honestly wouldn't have ever considered an AC a couple years ago, but now that summer means a constant 30°C I'm reconsidering. Like bro, 30°C used to be a HOT exceptional couple days, not the entire summer!
You are absolutely right about old stone houses. I live in an old stone cottage surrounded by trees and it's amazing in the summer. We turn our ac on a few weeks to a month after everyone else does(in the US).
The winters aren't too bad either. We have a tiny wood stove and even when using the oil furnace it holds heat in pretty well.
Side bonus! Home owners insurance gives us a break because the risk of fires goes way down when the outside is made of rocks.