Luna's Mexican restaurant has no address.

It is on no particular street, at no particular corner; even its habitues, its most enthusiastic devotees, are unable to locate it upon demand.

It is "over there in the quarter," "not far from the cathedral there." One could find it if one started out with that intent; but to direct another there--no, that is out of the question.

It CAN be reached by following the alleys of Chinatown.

You will come out of the last alley--the one where the slave girls are--upon the edge of the Mexican quarter, and by going straight forward a block or two and by keeping a sharp lookout to right and left you will hit upon it.