Think we used Avis without any problems in Capetown. The usual stuff you have to do with any car rental – just make sure your read the small print – returning it with full tank etc. etc.
Had no problems driving around, never got my hands chopped off or anything.
But yes, as someone mentioned, when you park up somewhere like the beach front you’ll probably find a guy beckons you to a car parking space if you’re on his ‘patch’. Depends how you feel about tipping for essentially pointing at a gap in the parked cars but I was on my hols, I can afford a couple of pennies for a smile if nothing else.
Taxis however. My god! Not sure if some we used were even road legal. And make sure you ask how much a fare will be before you set off…