adress has changed - former Bernbrunngasse is now
Münichreiterstraße: bis 1894 (Unter) St. Veiter Allee, 1894–1938 Bernbrunngasse, 1938–1946 Stuttgarter Straße
Münichreiter-street: up to 1894 (sub) St. Veit Avenue, 1894-1938 Bernbrunn-lane, 1938-1946 Stuttgarter-street
http://de.wikipedia.org/wiki/Unter_Sankt_Veit

no idea if the housenumber still would fit:
http://maps.google.at/maps?hl=de&cp=24&gs_id=hl&...
you can zoom in also and can take right above Satellit to see the house.

old pictures of Hietzing: http://www.pixelstorm-editionen.at/index.php?cat=c231_Hietzi...