I really like this place. It's a great local, family owned business and it's definitely in the top three Vietnamese places in Calgary according to my taste buds.
You can expect great, quick service. Portions are very generous and everything tastes really fresh. I'm a big fan of their Beef Sate Vermicelli dish.
There's lots of parking and it's very easily accessible from 17th, although there is a fair amount of construction in that area. It's a bit tucked in, so look at a google map or something before heading out.