Perched on the 6th floor of the DO & CO Hotel in the Haas Haus, Onyx Bar delivers what few Vienna bars can: a sweeping, eye-level view of St. Stephen's Cathedral through a massive mirrored bay window. The cocktails are solid if pricey, and the Asian-leaning food menu is decent, but let's be honest — you're here for that cathedral view and the see-and-be-seen atmosphere. Go for a sunset drink and soak it in.
A sixth-floor cocktail bar in the Haas Haus with a massive circular window framing St. Stephen's Cathedral like no other view in Vienna.
Come for a drink between 4 and 6pm on a weekday to grab a window seat with the golden-hour cathedral view before the evening crowd arrives.
Cathedral views and hotel-bar cocktails on Stephansplatz
Onyx Bar is the kind of place you take someone who's never been to Vienna — and watch their jaw drop when they see St. Stephen's Cathedral framed through that enormous circular window. Perched on the sixth floor of the DO & CO Hotel in the Haas Haus, the bar offers a view that's genuinely hard to beat anywhere in the city. The cathedral is right there, close enough to feel like you could reach out and touch the Gothic stonework, especially at sunset when the light hits the spire just right.
The cocktails are well-made but come with hotel-bar prices that might make you wince — think €15+ for a standard drink. Several Yelp and TripAdvisor reviewers note the same thing: the drinks are fine but not extraordinary, and the value proposition is really the view. The bar also serves food from the adjacent Onyx Restaurant, which does contemporary Asian cuisine — decent sushi, dim sum, and the like — but again, you're paying for the location.
The vibe leans upscale and a bit touristy, with a soundtrack that shifts from lounge during the day to more upbeat in the evening. Service can be hit or miss depending on how busy it gets. If you want the best experience, come for a late-afternoon drink before the evening crowd piles in — you'll get the golden-hour cathedral view without fighting for a window seat.