Although Yonge-Dundas square is one of the highest areas for tourist traffic, I don't find there to be many great food options within 10 minutes walking. If I'm hungry in this area, I'm satisfied that Asian Bowl is the best option around (I wouldn't even consider Ginger as an option...)
Although pricey for a bowl of pho, around 9-10$, the flavors are a sure way to cure a craving. A good ratio of meat and noodles, and the interior is nicer than the average asian food restaurant.
I've also tried the mango salad, which a good snack, but has a bit more vegetables than I like in my mango salad. The salad rolls here are also good.
Many of the reviews say that service is inconsistent. I've been here maybe 5 times or more, and I don't recall having too much trouble with service. Maybe for such a pricey bowl of noodles, service could be more attentive, but I don't have the highest expectations for any pho joint.