Will buying the property be worthwhile in the future?

Hello everyone, I found an old single-family home with a large plot of land that's in dire need of renovation. Here's the link to the listing: https://www.kleinanzeigen.de/s-anzeige/freistehends-haus-mit-grossem-garten-in-bondorf/2879067799-208-8098?utm_source=sharesheet&utm_medium=social&utm_campaign=socialbuttons&utm_content=app_android My question is, what do you experts think we'd roughly expect to pay for the renovation? The owner said there's still some wiggle room on the price, but…