Some airports have acceptable coffee, I remember Ljubljana favourably. Other airports just don’t deliver on the front of hot caffeinated beverages. Brussels seems to be strongly set on that list, as all the establishments I saw had those one-button-press machines. Those that generate a light brown insult to the coffee bean. So what do to? I have a 4.5 hour layover and the city center is 20 minutes by train. Is that going a bit far for a cup of coffee?