Home financing with interest loan and Riester or without Riester

KfW was mentioned, but rather labeled as not relevant. KfW only has a 10-year term and accordingly high repayments and would handle everything very strictly. With KfW, interest rates wouldn't be better and often only apply to complete measures and not just, for example, window replacements. But as I read, we are not on the right track.

Are you sure about KfW? 100k renovation and I read a lot about energetics.

No, certainly not. But at the bank, as mentioned, it was said to be rather not beneficial