Both were deleted with the same message:
Promotion of specific websites like imelda immobilien is not permitted here. – Stephen Ostermiller♦
My answer was not promoting the web site, I was just using it as an example. My use of the site (with which I have no personal affiliation, I simply know the people behind it) proves a point. In my opinion my answer was valid, and added genuinely useful information to the question.
Is there any way to appeal the deletion? I spent time and effort writing the answer, I found the questions while trying to find a definitive answer to the questions. After I couldn't do so, I figured out the answer my self, and then wanted to help other folks save the hassle. It feels like a smack in the face for somebody to delete my answers because they contain a link.