By booking an airport transfer at your arrival, you ascertain for yourself a safe drive to your hotel or back home. This way you avoid searching for a taxi when already at the airport, or waiting for hours until the sun rises. However, in many cities there is no need for taxi drivers who are impatiently looking for customers at any hour of the day. Also take a look at additional transfer services. They have all slightly different destinations, thus if the one doesn’t fit for you, try the next. Or keep the current apps at your hand. Probably they are even more popular in africa than in you home country!