... a great place to have an authentic Wiener Schnitzel?

During the upcoming Labour Day Weekend (Canada, US), I have a business class reward on LH from YUL to VIE and great rate at the Hilton.

I had a Wiener Schnitzel at Café Imperial and it was very good, though 'grand hotel style'. S'Parks Resraurant makes great schnitzels as well.

Would any Vienna natives or connaisseurs recommend another place around Bezirk 1 or 3?

Danke!