Don't know what took me so long to discover Dos Locos. After several recommendations from friends my wife and I headed in for dinner, and we'll go back. Margaritas where one could actually taste the tequila (45, I think, choices of tequila) and made without the sweet syrup. Go for the regular size, not the outsized one; the latter is big enough for two people. There's a rather full menu of lobster dishes, and my wife's lobster enchiladas were overflowing with sweet tender meat. My beef chimichanga was excellent, although the extra price guacomole was a smaller helping than it should have been. Nice casual ambiance, easy to find, not overcrowded or noisy. Sophisticated Mexico City it's not, but for American style Mexican it's very good.