So now I have registered especially, actually I usually just read along quietly
Sascha, are you from the area? I looked at the house online and at first glance it looks quite nice, but I think from the exterior and interior appearance it largely shows 80s charm (windows, facade/bricks,)
Last year I sold a semi-detached house in the neighboring town for a very good price and since I know the area, I would say you can easily negotiate 20,000 euros off or more. The house may be solid at its core, but the rest is already aged or could use some updates - Herten is a mining and working-class town and for this price you always get something in that area
Otherwise, I find your financial situation good and would trust a financing if you want to buy the house. If you are willing to pay the price, or if it is worth it to you, then I would have another inspection done with an expert and initiate all other steps.