Not exactly what the OP asked, but...

I flew to JNB last year, through NBO. Biz class on KQ. The simba lounge in NBO (biz class) was horrid. Small, crowded. Two computers, only one of which worked, veeeeeery slow internet connection (common in Africa). A few drinks, barely edible food (I am not that picky--all they had were a few pastries with evidently no sodium).

The guy in the chair next to me was snoring more loudly than anybody I've ever heard in my entire life, and I am not joking. It was truly incredible. This lasted for a few hours. Not that this is KQ's fault

Granted, most of my other lounge experience is in NA & western europe, so I may have unrealistic expectations--I kind of feel like a schmuck complaining about a biz class lounge in such a poor country. FWIW, there is also a biz class lounge in JNB for a bunch of airlines, including KQ. It was pretty nice, but then JNB has a large wealthy population.

Be forewarned--I thought my 5+ hour layover in NBO would be a breeze because of the lounge. I was wrong.