Heunisch & Erben
A short walk away from the city center, Heunisch & Erben is an upscale wine bar and restaurant lining the main road of Vienna's not especially lively District 3. More than a hundred mainly Austrian wines are available by the glass. You can explore lesser known regions, such as the Traisental in Lower Austria (Niederösterreich) and Steiermark's sauvignon blancs in the south.
Prominent Austrian labels from Wachau, Kremstal, and Burgenland are also stacked, as are natural wine producers. Take advantage of the "1/16" option, smaller pours that won't break the bank and allow for more wines to taste. While mainly a wine bar, the oversized space also serves notably expensive fine-dining-leaning dishes, meaning the crowd is heavy on shirts and suits.