I've come here a few times when working in the nearby British Library. The coffee is nice—I've only ever had piccolos, but they've been well-made and not too hot. The food is tasty and there are lots of vegan/vegetarian options. Tried their berry iced tea last time and it was heavenly, not too sweet. I tend to sit outside, but it's peaceful and not cluttered inside. The staff are smiley and kind. Definitely a good stop.
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