Hagen Espresso Bar (Hagen Mayfair)

You'll find yourself on a fairly anonymous stretch of Mayfair—all designer shops and suited types—but walk into Hagen and the mood shifts entirely. It's stripped back, Nordic-influenced, the kind of place where they're genuinely interested in how your coffee tastes rather than just moving you through the till. The espresso is consistently excellent, pulled with actual care, and they're not messing about with Instagram-baiting nonsense. Grab a seat at the counter if you can and watch them work, or grab a pastry (properly buttery, not that mass-produced rubbish) and take it to go. It's become a proper fixture for people who actually live and work round here, not just somewhere you stumble into between shopping trips.