Guillam Coffee House – Mayfair

Walk into Guillam on Curzon Street and you'll clock immediately that this isn't your typical Mayfair coffee spot. There's none of that stuffy, overpriced vibe—instead you get baristas who genuinely care about extraction times and bean provenance, served up in a space that feels lived-in rather than designed-to-death. The clientele ranges from local office workers grabbing a flat white before meetings to proper coffee enthusiasts who've sussed out that this is where the good stuff happens. You'll find yourself lingering longer than intended, either chatting with the team or settling in with a book, which frankly never happens in Mayfair unless the coffee's actually worth your time.