If you order right, this is a great place to eat. My recommendations: stay away from the deep-fried appetizers and the meat-intensive dishes. Try the following: the salads, which include a delicious salad of cabbage?, tofu, chopped peanuts and crispy onions on top (tofu salad) and a young ginger salad; the spinach and eggplant dishes; the noodle dishes, especially if you request the small bowl of chili paste to mix in; and there are a few veg & tofu dishes on the bottom left of the menu that feature an unusual, chewy form of tofu that is a little like yuba, only chewier. There is an unusual potato dish that is like curried mashed potatoes. I am totally addicted to the dessert called coconut cream cake -- a dense, moist (and often very hot--watch out!) cake made from something like semolina or farina, with a bit of coconut cream on top. Burma is on 6th just around the corner from the Chinatown Metro exit on 7th. It's on the 2nd floor, so look up for the small sign in the 2nd fl. window.
I second the recommendation. I used to work at Metro Center, and this place was only a short walk away. After reading about it in Washingtonian's "Cheap Eats" issue I'd wanted to go for a long time, but new restaurants are never as fun alone. I finally convinced a bunch of my co-workers to go with me one day, and we had an excellent meal at fairly reasonable prices. I'm a big fan of seeking out new and interesting cuisines, but I'm not quite well-heeled enough to go frequently, so I can't offer recommendations on a broad range of the menu. I can tell you that both of the soups we ordered were excellent, as was the salad ordered by my officemate. Everyone seemed to enjoy their entrees, there were several interesting vegetarian options on the menu, and a good time was had by all. There are a ton of interesting and semi-hidden little restaurants in Chinatown, but this one I recommend particularly.