Best African city for families?

A move to Africa may be in the works for my family (three children ranging from 4-12). We would have flexibility in terms of location and would appreciate input on a city based on safety, good schools (we would likely go international), reasonable cost, and easy access to a range of other African countries by air. Your input/experience is appreciated!

Hi - where in Africa are you looking 
I was born and raised partially in KwaZulu Natal, and Cape Town - Cape Town is the best for schooling; scenery and life in general but you REALLY need your street smarts for most places in SA.

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