When you think about a good diner, you anticipate tasty but not too healthy greasy hangover food that likely comes from a kitchen that hasn't been updated since the 50s.
Hazel's is a bit different than your average diner experience. They don't have much in terms of comfy diner booths (bummer), but in turn provide somewhat gourmet food coming from a visibly clean kitchen (bonus points!).
The burger and the shoestring fries are very good and it seems that the owners are trying to compete with the new Burger's Priest next door! Be warned that the burger and especially fries will be mysteriously extra soggy if you ask for takeout, so take the time to enjoy your burger right away!
The service is very pleasant and amicable and the prices are reasonable.
The wait time for the food might be a bit longer than expected, but you can just use that time to bask in one of the better diner atmospheres in the city of Toronto.