How can I possibly rate tourism in a Nairobi for instance as prosperous or not what are the possible indexes for measuring tourism success factors in this case.
Hello, Celestine Otianga - this special issue of "Current Issues in Tourism" about global change and tourism in national capitals may be useful for you. My contribution there is Article Out of the Soviet Union: the re-emergence of Rīga as a tourist capital
I would approach it from the sustainability angle, because no destination can be successful without studying long-term impacts. As for city tourism, you might have to cover overtourism, carrying capacity, tourism mobility, slow tourism among otehrs. I have been doing research into slow tourism development in urban areas, and that path can be one of the alternatives you could embark on.