JOHANNESBURG — Olivier Gremillion - who is in Davos this week for the World Economic Forum - spent 7 years at Airbnb before joining global travel bookings website Booking.com. Now, he's heading up Booking.com's non-hotel business, providing a competitive alternative to that of Airbnb. Olivier has a good knowledge of the African travel market, including that of South Africa. And in this interview, he explains why he's more upbeat than in previous years about the African travel market. - Gareth van Zyl