Before hiring any writer, including those from Kenya, I would recommend doing a lot of research. Review what others say, request samples, and communicate well to make sure the service is dependable. Since scams exist everywhere, check the credentials of the person you are dealing with and never pay upfront without a guarantee.
"Samples" could have been written by (or stolen from) anybody; "communication" is totally unrelated to dependability, (because scammers are notoriously "communicative" before they have your money in their hands); "credentials" (such as degrees) are almost equally unrelated to writing ability; and there's no such thing as any "guarantee" that's enforceable or that will help you besides knowing the real (verifiable) identity and (verifiable) location of your writer within a First-World country.that prosecutes blackmail and extortion.