London

Tripadvisor released the results of its consumer survey this week, detailing opinions of the best travel destinations. Among European cities, London did very well, of course. Heathrow airport ranked equal top of the worst airport list. And the largest proportion of respondents ranked it the most dirty and the most expensive European city, along with the most poorly dressed citizens. But you don't need a survey to tell you this - 5 minutes on London streets is all you need.