Einliegerwohnung - double subsidy and tax benefits

I believe that renting out as a holiday apartment is excluded, that is with regard to funding.

Yes, I believe that too. Whether it will be old people or younger ones is still open. Unfortunately, it is really the case that we see it more as an option for a later case (if it becomes financially tight). Since it is our first home, we would like to use it ourselves at first. Currently, that is not a financial problem.