The campsite at Mata-Mata rest camp has a mixture of small, well-shaded, and unshaded stands, all with electricity (generator, until 10pm) and water. They are numbered, but not otherwise demarcated, leading to frequent "discussions" as to the relative positions of people's tents and vehicles.
The toilet block is clean and well-serviced with showers (there is a bath in the ladies only). There is also a scullery.
The pool is small and unshaded, but there is a shaded lounging area to one side with some loungers available. It was a little green while we were there, but was clean and refreshing.
There is a fairly pointless hide (as nothing else is hidden, the campsite is all around) overlooking a floodlit waterhole which sees regular animal traffic. The hide is not particularly well-maintained with a lot of graffiti and holes in the floor. The steps leading up to it are in need or repair and may present a hazard in the dark.
The camp shop is reasonably stocked but has no card payment facilities despite the fact that the camp office, 20m away, has. It is quite expensive, so you would be advised to stock up before arriving. There is a farm shop on the Namibian side which border guards are happy for you to walk to selling meat, etc.
Fuel is available, but once again no card payment facilities, so be sure to bring cash. The nearest ATM is at Twee Rivieren, a good 120km and 3.5 hours drive away.
Chalets are also now available at this rest camp.