This sushi place is one of the better sushi restaurants I've tried in Toronto. I LOVE the Volcano Roll- it has cheese, avocado and tempura inside and is covered in a spicy sauce. The miso soup is also really good. I like to order the tofu as an appetizer- it is soft and covered in a delicious sauce. I have ordered one of the dinner bento boxes before with sushi, sashimi and tempura but was disappointed that only 1 piece of shrimp tempura was given. The standard at other sushi places is at least 2 pieces of shrimp tempura. Other than that though, the quality of the food in the bento box was pretty good.
For seating, there are several booths off to the side which offer more privacy as well as regular tables. There is also some outdoor seating.
I've been here at very busy times when the restaurant was full and also at times when I was one of the only customers in the restaurant. Service is always polite and friendly, but I feel that Ume Sushi really needs to have two waitresses working at peak times. I've noticed that service at those peak times with only one waitress tends to be quite slow, and it's hard to get her attention. I'd recommend installing buzzer buttons in the booths to make it easier to call the waitress without leaning out and waving.
The washroom in this restaurant is so clean and always smells AMAZING! I also like the Bento Box magazine (a magazine about Japanese restaurants and culture in Toronto) that they have in the newsstand by the door.