Saw this article on BBC news
http://www.bbc.co.uk/news/uk-england-london-14034028
If London is the easiest city in Europe to get around, then the mind
boggles as to what other cities must be like.
Perhaps the survey is not very respresentative. If the TripAdvisor
members have not been to many other European cities, then they will
not have much to compare London with.