According to Dr. Strahalm of the City Archive of Graz, the address of Johann Ranner on Beth's attachment is Wienerstrasse 274.
When one looks at the entry, it is evident that there is additional address info before Wienerstrasse, namely, "St.,""Josephxxx" and "Au," maybe meanng St. Josephs Au. Au means the forest surrounding a river bed, and there are Auen of the Mur river in Gösting. There is an Augasse and a Fischeraustrasse. Anyway, the street address Wienerstrasse 274 is precise enough for Beth to find out where Johann Ranner lived.
The online phone directory of Graz at http://www.herold.at/en/telefonbuch/
lists about 15-20 Ranners, some of them academics. Perhaps Beth could send all of them a letter about her search.