Nairobi is not what it used to be, but if you are a bit carefull you can still have a great life there. Depends very much on your mindset if you are going to like it.
Flyingwise it may be a good opportunity to get into the scene in Nairobi. There a quite a few jobs on twin turbine aircraft, once you get to know a few people and are able to sort out the workpermit hassle. So, instructing for a year or 2 would not be a bad idea.