For a relaxed meal and/or drink on a summer's evening, try Place St Boniface, close to Porte de Namur metro station. There are many good restaurants in the square and the surrounding streets.
Try Au Vieux Bruxelles for traditional Belgian cuisine in (sometimes very!) cosy surroundings or Mano a Mano for simple, high-quality Italian food. L'Ultime Atome is a great choice for a drink, with a good range of beers and outside tables; it also does decent, brasserie-style food if you're peckish.
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