We have stayed at former Pontchartrain Landing, now called New Orleans RV Resort and Marina several times. Industrial area but never any issues. Easy to get to now that they repaved the access road. Gravel sites, some waterfront, decent location and they do take PPA. We usually drive our own vehicle in to FQ, about 15 minutes (6 miles), they also may have a shuttle but last time we were there (March) it was shut down due to Covid. We park in the lot behind Cafe Du Monde and the French Market which is right across from Jackson Sqare. If driving south on Decatur, go past Cafe Du Monde, then turn left on St Peter, then left into the parking lot. Last time we were there around $12 all day I think. Surprisingly its a pretty easy drive in and out. There are a couple other lots around that area as well.
Google map location of parking entrance: Dropped pin
https://maps.app.goo.gl/M16136pASV9wwPP2A