LONDON (Reuters) - Visitors to London have marked its hotels as the worst in a list of 100 cities due to overpriced minibars, lousy breakfasts and slow service, according to a survey released on Friday. A study by travel metasearch website Trivago of hotel reviews from more than 140 accommodation booking sites found London came last in a list of 100 cities that had at least 135 hotels and 60 reviews. The 5 best cities for hotel rooms: 1. Dresden, Germany 2. Hanoi, Vietnam 3. Portland, US 4. Tokyo, Japan 5. Santiago de Compostela, Spain. The 5 worst: 96. Amsterdam, Netherlands 97. Paris, France 98. Copenhagen, Denmark 99. Rio de Janeiro, Brazil 100. London, UK