Paltoquet is a pretty awesome little cafe / patisserie. The only trick is getting a table.
The croissants were apparently voted some of the best in Montreal, and I believe it. They are incredible.
The breakfast/brunch is pretty spectacular - simple flavours but just very well done. I particularly love the oeufs paltoquet, which are a lovely combination of eggs, ham, and cheese that is delish, but all the combinations are delish. For a very simple snack, try the "croissant avec confiture" (croissant with jam). Yum.
The desserts and cakes are also pretty awesome. The pista-choc is to DIE FOR.
If you plan to go with kids be aware that there is NO room inside for a stroller, and the only high chair they have is really only good for kids old enough to not need a highchair. Be prepared to have baby on your lap. But the food is so good it is totally worth it.
The only drawback of Paltoquet is that it has a lot of regulars who hang out all morning and make it hard to get a table. It's just so good that no one wants to leave!