If you want to experience Kenyan food and mingle with Kenyans, Njugunas restaurant nairobi is the place for you. It is very local.
Not the cleanest of toilets - make you question the food but i must admit - has the best nyama choma (barbecued goat meat).
Drinks and food reasonably priced.
Be careful, if you are white, you might be open to exploitation....plus you would stand out like a sore thumb!.
only go there with a local guide.