Although I do not recognize the name Hans Fuchs, I have Fuchs ancestors from Wien. My ggrandmother was Clara Fuch. She was probably born before 1860-65, perhaps in Hungary. She married Moritz Wolf, probably before 1880. Moritz Wolf was born in Austria and died there in 1906. They had six children and lived in the Mariahilf District in Wien. Clara died between 1941 and 1945.
Unfortunately, I do not have information on Clara Fuch's parents and siblings.