Oh Schreck mei Hos' is weg (1975)

Mr. Schmidinger, a Bavarian from Texas, inherits a hotel from his stepbrother in Heidelberg. He flies to Germany, where his luggage and savings are stolen, and finally ends up in his hotel after an adventurous hunt for the suitcase. He checks in incognito and soon realizes that he is in a brothel. The American, horrified and utterly shocked, dismisses the staff and girls in order to turn the dirty inheritance into a clean hotel, but then the protectors spring into action.