Tiny, cheap New Pasteur is one of my favorite Viet Namese restaurants in Manhattan. Their lemon grass squid is perfect, the pho (broth with noodles and meat) is fresh and flavorful, and their traditional condensed milk hot or iced coffee is the best in the city. Lots more vegetarian options, too, than the average Viet Namese restaurant.
Pros: Great food, low prices, prompt service
Cons: Strictly no-frills decor