I took this recommendation from a local patron at La Casa de Habano, and glad I did.
The huge stone building appears to have been a stable, or at least it has a courtyard for carriages.
Try the Beef Wellington. It is excellent, tender and the mushroom sauce is the bomb. It's enough for two if you are having salad and dessert.
Get a reservation. This place stays busy all the time. It's a Montreal favorite for dinner and celebrations!