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Actually you've answered your own question, if you really take the trouble to have a think about it. City destination. You are limiting my responses to cities when it's entirely possible I might prefer non-city destinations. My original opinion, however misguided, was there are so many more interesting places, not cities. That said, my original response was too flippant. Of course London is an amazing city and many others here have shared their knowledge well - the OP will have picked up some wonderful tips and be in for a great stay. In fact I have too.