His friends call him Obi One. And the American embassy calls him when they need a security assessment of the favela Rocinha, according to this 21-year-old. He runs a guesthouse high up the hill, and you could say he has a good perspective of the situation in the city's biggest slum. It's the middle of summer here and should be high season for tourism, but Obi One says this year business isn't as good as expected. His view reflects that of several other business owners around the city, who think tourists are staying away from Rio after hearing of the increasingly fragile security situation, bad press around the Olympics, and subsequent corruption probes.