Having been to Japan in the past, the food and ambience at Zakkushi is as authentic that you will get in Toronto. They actually serve oden, which most Japanese restaurants in North America do not have. Many of the actual Japanese patrons order this too, (it is a variety of tofu and veggies in a very rich broth, highly recommended in winter). Owners, please don't reduce the variety of oden !
We have been to Zakkushi over a dozen times, and enjoyed every time. Book in advance, this place gets filled up quick. Servers are great, when we went for Halloween they were all dressed up too. Been to the other izakaya type restaurants nearby (looking at you, Guu) and the food was nowhere near as good, with sauce that was just amateurish. Would definitely recommend eating here !