The old estates in Nairobi’s Eastlands where the African working class and the walala hoi lived, had clear addresses with proper signage. My uncle lived in Kaloleni house number X11. To get there was easy since the houses were numbered logically and arranged in rectangular blocks with wide boulevards lined with trees in between.
The same was true of the newer estates: Ofafa Maringo, Ofafa Jerusalem and Ofafa Jericho where well-arranged flats were logically numbered so that getting an address was not rocket science.