Despite the abundance of coffee shops in Toronto (excluding Starbucks or Tim Hortons), I find myself drawn to Sorry Coffee every time I need a caffeine boost. That's partly due to its close location to my classes, but mostly because of their coffee.
Their pastries are delicious (I recommend their chocolate croissant) and their coffee is fantastic. Service is fast and friendly as well.
Other reviewers noted the limited seating (which is true) but if you really do need to sit down, try avoiding morning and lunch rushes.
Overall a solid coffee shop.