Pho 88 is probably the most popular vietnamese food chain in Toronto. I've been to this location twice, and ordered pho both times. I usually frequent the Markham locations and I couldn't find much difference between them.
The pho here is excellent. Almost just as good as the Markham locations. The soup is tasty, the beef is thinly sliced and easy to eat, the noodles were cooked perfect.
Parking is free which is advertised on the outside as you drive along Spadina (you'll get a card to stamp which gives you about 1.5 hours of free parking). The parking garage is kind of ghetto ... so I recommend bringing a friend so you won't be scared.