We were skeptical about camping in a city like New Orleans. We weren't sure if it'd be clean, safe, or spacious enough to actually camp, but we were super impressed with the New Orleans West KOA! Our campsite was large, under a huge shady tree, and the pool was clean and cool. The whole camp is within a walled area near the airport, so the only disturbances in the night were people in the adjacent neighborhood or a plane or train nearby, but other than that we slept comfortably and felt safe.
Definitely take advantage of the free shuttle to the French Quarter that this KOA provides... not only is it super convenient, but the man/camp co-owner that drives the van doubles as a "tour guide", and it is a ridiculous, informative, and very entertaining little trip. ;-)