In a rural but well maintained area in France, my parents bought recently an old family house for 80k (to which you have to add some renovation costs). In this area a brand new house with a good amount of land is 200-300k. In my own area, a new house is more along the lines of 500k. In any case those things are highly localized here, I imagine it's true in Austria as well (though the country is much smaller than either Finland or France).

Rural Finlan and it is row house and about 100m^2 but generally you can get fairly good new house at rural Finland somewhere between 200k-300k.

>How is a house so cheap in Finland?

Because nobody wants to live outside Helsinki these days. So there's a lot of supply and low demand everywhere else.