Nightshade

You descend into Nightshade like you're entering somewhere that actually cares about what goes in your glass. It's properly underground—literally, in a basement just off Cardiff's main drag—which means the vibe shifts the moment you hit those stairs. The space is dim and atmospheric, all shadowy corners and the kind of lighting that makes you want to linger over your drink for hours. Their cocktails aren't the novelty kind; they're built on solid technique and proper ingredients, the sort of place where the bartenders know what they're doing and won't judge you for ordering something straightforward.