I had read about this place on happycow and decided to stop in on my Portland trip a while back. Here's my Bombay Chaat House review.
This is a food cart, not a restaurant. The guys working in the truck were friendly. I ordered a tandoori bread with potato stuff and a chai with soymilk. There was a small line of people getting food here. Very cheap food. Tasted okay. But the chai was too sweet for me (likely sweetened with regular sugar).
Street food feel, nothing gourmet, but fills a craving for quite Indian bite.