Coffee is consistently top quality. Try a gibraltar, skip the Pikolo latte -- it's just too small -- and if you're hungry get a croissant. The espresso will be well-pulled and too much milk will sometimes distract from that.
Despite being amidst the bigger McGill student study area, it's a gem. The coffee shops around are larger and cater more to students, but Pikolo caters to the person who really just wants a great coffee. To get a seat for sure, come early before the McGill students get up.