Usually, Wilfried is the one to correct me with good reasons, but this time I insist his correction is wrong (Wilfried, you are living too far in the north to know this).

It is troditionally der Schnitzelbank in this song and 'schoener' is then of course correct too.

Why? See this old thread about the song. The link in my old post is still valid and points you to an explanation why der Schnitzelbank is at the very least acceptable if not the only correct German.

Wolfgang