Re research in Vienna Archives, the Israelitische Kultus Gemeinde
whose records are archived >from 1825 (circa) onward for the Jewish Viennese
residents, and then accordingly there are vital records archived for the
Catholic Viennese residents at the Catholic Diocese.
You may be able to obtain their telephone numbers via the tel.directory
operators, and phone ahead for particulars.
Have a great time in Vienna! I visited three years ago and loved it.
Almost everyone spoke English which made it easier. Try the pastry (if you have
a sweet tooth) at cafe Sacher . I was disappointed in the pastries at "Aida"
for they looked great but they all tasted the same.