We stopped here on our way driving back from Kruger to Johannesburg. If you are self-driving then add this to the list of places you visit en route to/from Kruger. They have three tours a day that last anywhere from 1hr15min to 1hr45min. Such a lovely experience to see all the rescued chimps, hear the stories behind each of them and learn about how some of them, but not all, will eventually be released back into the wild.
Road is fully paved from the entry point up to the parking lot - 2WD vehicles entirely fine.