If you aren't looking for this place, you will miss it, guaranteed. And that would be a tragedy.
Hidden away at the back of Bons Scoops is one of the best places for coffee in Montreal. The baristas are super friendly and the coffee beans change on a regular basis. The place is small and there isn't a ton of seating (a few two-person tables, a communal table, and some bar seating), but it's relaxed and inviting.
One of the only places to get good coffee downtown. Sadly, it will be closing at the end of July =(