Alto's is bomb. While the food is pretty standard in general terms, for latenight eats in Montreal (its open til either 4 or 5 am most nights, including delivery), their service is pretty much impeccable and their quality is consistent and most importantly, FAST.
I have never once had to wait more than ten minutes for my food at altos, or more than 20 minutes for delivery. And it's usually faster.
Plus their gyro and cheeseburger combos are a pretty good deal and hit the spot after a long shitty evening at the library or better yet one spent out getting crunked.
The all dressed pizza and milkshakes are also pretty good.