Five stars because it's in a fun neighborhood, the food is outstanding, and they are very vegan-friendly. My absolute favorite dish is the tofu in peanut sauce (either #33 or #34... the other of the two is my second favorite). The spring rolls are a marvelous start to a tasty meal, and can be made vegan upon request.
Spiciness is really an individual thing... I usually ask for 1 1/2 to 2 stars because I like a little heat but not overpowering. I find that 3 stars can make you sweat, but then again some people don't think that's enough!