http://www.storyvilledistrictnola.com/ this one of the best treatments of this section of town. Jazz was allegedly born here as well, on the pianos in these large mansion brothels. "Big easy" was a nickname that the musicians gave this city because it was easy to find a gig here.
"Placage" is another interesting part of prostitution in the city. When the Yankees won the war they refused to do business with the black population (and ended other institutions), including the free black businesses that had been thriving for generations. Many of these former privileged women and economically secure, if not wealthy women, ended up in brothels. Therefore there was a time when black women made more money than any other type of prostitute in NOLA, when the institution of placage ended and the businesses the women owned were shunned. The pamphlets at the time (their version of eccie I suppose) would list the women's attributes, and these women were the belle of the ball.