LGBTQI+ scene
Wikipedia defines Vienna as "Austria's queer capital". The scene is concentrated on the Naschmarkt axis between districts 4 (Wieden), 5 (Margareten) and 6 (Mariahilf), with no single closed-off heart like Chueca, but dense enough for life 5-7 days a week.
A mix of Austrian classics (Café Savoy since 1896, bear and leather bars in Mariahilf) with a younger alternative queer scene in Neubau/Spittelberg and on the edges of Margareten. Nightlife is earlier and more orderly than Berlin's — Vienna closes earlier and hums differently.