Café Olimpico is arguably one of the most famous coffee shops in Montreal, and it's deservedly so because the coffee they serve up is just pure awesome.
Be prepared to be served some very super duper unique lattes by the beautiful gentlemen behind the counter. Unlike the gourmet lattes you find in most coffee shops, the ones here are uniquely Italian style. It's creamy and rich in coffeeness at the same time and in perfect harmony (kinda like Opera singers, yea). The lattes are also super cheap compared to most places ($2 - $3 the last I checked).
The decor and staff will in no way hold back any of that Italian pride. The shop is filled with Italian football flags and jerseys, and most of the staff conduct themselves in full Italian hipster style.
Hipster? Yes, very much so.