The rather drab Sheraton hotel in Rio de Janeiro seems to epitomise some of the particular difficulties facing hotel chains in Brazil.

As advertised in the blurb, it is the only beachfront resort in the city, sitting by a quiet stretch of white sand. But although renovated, it has a functional look and as you lift your eyes, you stare right at one of Rio’s notorious favelas, draped menacingly over the hill above.