After doing a whole lot more trawling through the web, I came across this on tripadvisor.co.uk › Africa › Namibia › Namibia Travel Forum - and here I quote, "This is a warning to anyone considering booking with the "Spitzkoppe Reservations and Info Centre" run by Lesley Tjongarero" - which appalled me.

We have now decided to just turn up and see what happens. However, a warning to other members might be in order. Admittedly this warning was posted in September of 2015 but from our experience recently, it still applies.