Were this the only Vietnamese place in Cleveland, this would be five stars. The pho is fantastic, and in huge yet manageable portions. If you're hankering for an appetizer, go for the salt-baked squid. They know how to cook it so that it's done, but still tender and with a delicious salty taste.
However, there's #1 and Superior just a short drive away, with ample parking and for substantially less. When I have to pick a place on East 4th, I pick Saigon. When I have to pick a Vietnamese place, I go elsewhere.
I'll stress that I've only had good experiences with this place, though, and your results may differ. It's just that I've had better experiences elsewhere.