It's amazing considering the location (just between La Bourse and Grand'Place) that Le Cirio has kept its character. It is perhaps one of the most beautiful turn-of-the-century "old Brussels" bar in town. And everything's there: the brass, the marble, the little old madameke and her dog enjoying a drink.
Entering Le Ciro is like entering a time capsule, and as soon as you push the door, the hustle and bustle of Brussels' traffic fades away. The dark woods and quiet will invite you to relax and please. Order the half-en-half (a mix of white wine and bubbly).
With the "mushrooming" of trendy (and ephemeral) bars all around town, Le Cirio is a classic and a fixture, great to go back to when fed up with all the glitz of those new cafés.
Another piece of advice: bring your sweetie with you; it will make you look so grown-up and responsible.