21Gam - Cocktail bar in Hanoi

Trương Hán Siêu is a quieter street that peels away from the noise of Hoan Kiem's main tourist drag — close enough to the Old Quarter to be convenient, far enough that the clientele skews toward people who actually know where they're going. 21Gam sits on this stretch and has built a steady following: 235 Google reviews at 4.2 reflects a place that earns repeat visits rather than one-time tourist traffic.

As a cocktail bar in a neighbourhood better known for bia hơi corners and rooftop tourist spots, 21Gam occupies a different register — the kind of place where the drinks are the point. The name itself (21 grams is a unit of weight sometimes used in bartending for precise pours) signals that the bar takes its craft seriously without announcing it loudly.

The Cửa Nam ward location is slightly south of the main Hoàn Kiếm lake circuit, which keeps foot traffic intentional. The crowd that finds its way here tends to be a mix of Hanoi locals looking for a neighbourhood bar that isn't a beer garden and visitors who've done enough research to want something beyond the backpacker strip. It works as a first-drink destination before dinner or a last stop after one, and the intimate scale makes it suited to pairs or small groups rather than large parties.

For cocktail bars in this price bracket and neighbourhood, the rating holding above 4.0 across a meaningful sample of reviews is the clearest signal available — Hoan Kiem has no shortage of options, and sustaining that average requires consistency.