I try not to go there too often, but it's a difficult temptation: the coffee-to-go shop in Haarlem. I like the coffee here at Chess a lot, but the fresh espresso in Coffee To Go is extremely delicious. Today I bought a customer card that gives me a 10% discount.
The people working in the shop are often involved in coffee- and espresso making contests; on their website there's a short manual on making espresso's.