A co-worker introduced me to this place, at the back of the indoor Winter Street arcade, which is funky and dingy in its own wonderful way. (Not to be confused with the downtown crossing food court)
Greeted with a free falafel dipped in hummus - yummy!
Had the falafel sandwich, which was three falafels, broken into pieces, with lettuce, tomato and I think pickled peppers and smothered in a yogurt-tahini sauce. $4 is a really good deal for this sandwich, which was filling enough to satisfy but doesn't make me want to curl up and take a 2 hour nap like Chacarero.
I found the falafels to be of good quality and fresh tasting, which contradicts some other posts I've seen (in particular one from 2004, so maybe they have improved).