I used Uber for cairo travel. If you specifically need a tour guide you can PM me, I used him for longer distance driving. You can buy a sim in the airport for cheap. Beware for harassment and no matter how many people tell you this you still need to hear it again. It's not a reason not to go it's just to be aware of.
Thank you. PM sent.All additional info welcome from others, as well, here or via PM. Thanks!