Darvish is my go to spot for Persian food in the city because the food is good and its close to my home. I am not sure how it compares to other Persian restaurants in the downtown core, but on its own I do like it.
I normally get their khoobide kebab, which is the ground beef kebob. Its juicy, flavourful and charred just right. Their fesenjoon is also good. The dishes come with a sizable portion of your choice of fava dill or another type of rice and charred tomatoes or salad. I recommend the fava dill rice and the tomatoes.
The server--- the same woman who always works there--- is very nice and the ambience of the place is relaxing because of some really lovely soft music that they play in the background. Prices are in the $11 to $17 range and given the very large portion sizes it is worth the price.
One star off because I had a bad experience with their lamb shank stew which was too boney.