Phew, stay away, I would say. A huge ruin cobbled together somehow, you might as well throw the money down the drain. The walls worry me the least. If the house was already founded almost 100 years ago, there probably won’t be much settling left to happen. But apart from the shell, you basically have nothing. On the contrary, you probably have to fix the patchwork chaos left by the previous owners.
All that for 150K€ to renovate 260m²? In my opinion, that’s not even enough for half. And what are you going to do with 260m² then? Heat it?