I am currently in Nice with my wife and two children, took a walk down to the prom last evening. We were in need of a public toilet and couldn't find one anywhere! Spotted one with arrows down stairs but was closed off, another in a park was closed as it seems they're having some sort of festival. In the end we were forced to use McDonalds (wouldn't normally do this!). Did ask at tourist info and they gave us details of the closed one in the park, the closed stairs one was opposite the TI office (if that helps), believe near the sporting beach.
Didn't see anything of the portaloos I'd read about? Can anyone advise? I can't believe such a busy destination would have no open facilities!