Hausbrauerei Zum Schlüssel is a traditional brewpub located in the heart of downtown Düsseldorf, in the Nordrhein-Westfalen region of Germany. As one of the city's historic Hausbrauereien, it is deeply rooted in Düsseldorf's rich brewing culture and continues to uphold the centuries-old craft of brewing in the Altstadt, the old city centre. The brewery is a beloved landmark for both locals and visitors seeking an authentic taste of regional German brewing heritage. The brewery's portfolio centres on the classic Düsseldorf Altbier style, with its signature beer being the Original Schlüssel — a Traditional Altbier brewed at 5% ABV. Altbier is a top-fermented beer style native to Düsseldorf, characterised by its copper-amber colour, firm malt backbone and clean, moderately bitter finish. Zum Schlüssel brews its beer on-site, staying true to the Hausbrauerei tradition of small-batch, craft production served directly on tap in the brewpub. The taproom at Zum Schlüssel is an integral part of the experience, offering guests regional German cuisine alongside freshly brewed Altbier in a historic setting. The brewery is frequently included in guided Brauhaus tours through Düsseldorf, alongside other renowned local breweries such as Im Füchschen and Schumacher, cementing its status as a cornerstone of the city's Altbier scene.