The survey of 2,376 European travellers by the TripAdvisor company also called the British capital to inhabit the worst-dressed locals.
If this was not enough, London was reckoned to have the most tourist traps, but also the best free attractions, easily the best public parks and the best nightlife.
It was for the second time in row that London had been voted the dirtiest European city in the poll, and that too with a huge margin.
A total of 36 per cent travellers claimed the Queen's city as the dirtiest- well ahead of Paris in second place with 9 per cent.
However, almost 50 per cent of those polled rated London best for public parks, with Paris a distant second with just 7 per cent.
"I have travelled quite a lot and there are NO parks in the world like the ones in London, especially St James's Park,' The Independent quoted a traveller as writing a review on the TripAdvisor website.
The cleanest city was considered to be Copenhagen, while the bargain city was Prague, the friendliest was Dublin and the most boring was Brussels.
Paris had the best-dressed locals and the best cuisine, but was easily the least friendly.