Southern-suburb compounds are large and often older. Check the borehole yield and whether the generator covers the water pump, because a Karen power cut without a pump means no water at all.
For this audience the single most important specification is borehole water. Nairobi Water rations supply across much of the city, and in dry months whole suburbs go days on tanker deliveries. A working borehole is the difference between water in the taps every morning and a monthly tanker bill that can run to five figures. It is the most quietly important amenity in the Nairobi rental market.