Fontainas became a tradition for me in Brussels. Moved to the city 3 years ago, fontainas is one of the places I keep on visiting every now and then.
Especially convenient on a sunny Sunday morning, the best place to read a book and enjoy a good coffee. Staff is relatively friendly (really depends on who is serving as I had friends complaining on that issue - dont have any negative personal experience though).
They also sell small and tasty snacks and is quite convenient for lunch in the centre of the city.
Bottom line: I recommend the place for coffees, lunch and early drinks.
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