Via the (greater) Brussels Ring
Exit 13 Dilbeek/Ninove
Follow the Chaussée de Ninove (=N8) in the direction of Molenbeek
until you arrive at the Porte de Ninove.
Turn right
At the Institut des Arts et des Metiers, go across the tram rails

and turn left
Immediately take the first street to your right (=Rue de l’Abattoir)
At the crossing take left
You arrive at the crossing Rue des Fabriques / Rue de la Senne
Where the shop is located
 

Via the (small) Ring coming from the South Station
Follow the Boulevard du Midi
Just passed the Porte Anderlecht (=50m)
Take the first street at your right (= Rue de la Senne)

You arrive at the crossing Rue des Fabriques / Rue de la Senne
Where the shop is located
 

You follow Boulevard du 9^ième Ligne, then the Blvd du Nieuport 
At the Porte de Flandre

You take left (=Rue Antoine Dansaert)

At the first traffic lights you take right (=Rempart des Moines, Rue du Grand Serment)

That way you arrive at the crossing, Rue de la Senne/Rue des Fabriques
Where the shop is located

Tram 81 and 82
Stop Porte de Ninove

Follow the rue Orts (=street opposite to the Stock Exchange)
Take the first street on the left (= rue Van Artevelde)
At the rue Pletinckx (=first cross road)
Keep to the right until you arrive at the Place du Jardin aux Fleurs
To the right = Rue des Fabriques
 

Walk to the Vieux Marché aux Grains
Until you arrive at the Rue des Chartreux
Follow the Rue des Chartreux to the right
Until you arrive at the Place du Jardin Aux Fleurs
To the right = Rue des Fabriques