I'm not sure there's a street number, but the Grillhuisje is just around the corner from the bridge to the Beguinage.  Winjngaardstraat is the main street on which many first-time tourists enter Brugge from the direction of most of the tour busses, the train station and down by Lake Minnewater.  It's also just a short stone's throw from where the horses and carriages start their tour. 

The Grillhuisje is on the left of the street, heading into Brugge in the general direction of the Market Place and the Octagonal Tower. 

Our party of four sat down and was immediately served a small plate of grilled ribs with some sort of Belgian seasoning...they were great! 

Unfortunately, we didn't fully understand the menu, because we weren't very hungry and just wanted to split a few items...nothing to split...we all got a full meal.  But no big deal, dinner for 4 was just 1735 bef (about $35 at current exchange rates).

The grilled salmon was fantastic...as was the halibut...as were the ribs...nothing to complain about here.

Food:  A+
Ambiance:  A...REALLY funky!
Attitude:  A+  Very nice folks!
Parking:  What parking?  You're in Brugge and you walk nearly everywhere.
Service:  A
Value:  A+