The Kupferquelle Resort is a bit of an oasis on a long drive. My family and I live in Angola, and every now and then make a drive to Windhoek. To break things up, we'll stop here and setup our caravan to camp. The sites are nice and clean, have green grass and plenty of shade from large trees. They all have potable water and reliable power for those with caravans, and the bathrooms are perfect for families with small kids. There is also an olympic sized swimming pool for those who want to get some laps in or just relax a bit after a hot day.
I will note that the last 2 times I was camping there in Oct 2016, I noticed that 3 of the campsites seem to have a lot of bees buzzing around. They were really attracted or irritated by the car and caravan. I just moved a few sites away and notified administration of my move.
The onsite Dros restaurant is also a nice place to grab a bite if you're not feeling like cooking on your own. They've got kids menu's as well as a place outside for kids to play at.
They've been under various levels of construction this past year, but I don't feel that any of it has effected the quality and service I've come to expect.
I've never stayed in their rooms, but I would expect them to be just as nice.