This is the first Izakaya that I've ever been too. I've been coming here for years now and they've been amazing every time. It's the place I bring my friends to if there is a celebration.
I don't drink Sake but I do enjoy the food here. I come specifically for the yakitori. They cook the food over a charcoal grill. You can see one of the chefs there cooking over a small grill and constantly fanning the food.
I haven't tried Guu yet, so not sure if this is the best in Toronto or not.
If you didn't make reservations and the place is packed, head next door to Niwatei or Shiso Tree.