Located on the outskirts of the vibrant Borough Market, Monmouth serves arguably some of the best coffee in London. This place almost always has a line, sometimes wrapping around the building. There are other locations around the city as well – Covent Garden and Bermondsey (only open on Saturdays). Their beans are sourced from all over the world, roasted at Bermondsey, and delivered to their stores on a daily basis. If you want a seriously good cup of coffee, this place will not disappoint.