Tokyo's hotel rooms may not overlook any white sandy beaches or have gorgeous frescoes dating back to the Italian Renaissance, but tourists say there's one key factor that's driving their popularity.

Based on the opinions of more than six million users, hotel booking portal Hotel.info said that Tokyo has the cleanest hotel rooms among selected international cities.

Japan's capital scored 8.93 on a scale of one to 10, where 10 is best. Warsaw placed second with 8.76, followed by Seoul's 8.73. Slovakian capital Bratislava and Bulgaria's Sofia tied for fourth with both scoring 8.54. "The hoteliers in Tokyo come out very well in comparison with other large cities in an international survey. Guests in Warsaw could also eat their food from the floor," hotels.info said in its press release. Rio de Janeiro ranked at the bottom of the list with a score of 7.29, followed by London (7.52), Oslo (7.53) and Amsterdam (7.58). Despite its rich tourism offerings, Paris also scored a lowly 7.63, placing it sixth on the ranking of cities with unclean hotel rooms. Hotel.info provides services for more than 250,000 hotels globally. The company is a member of Germany-based hotel booking portal hotel.de. If travelers find themselves in an unhygienic room, they should "remain polite but firm and request that the shortcomings be corrected immediately or that they be permitted to move to another room," the company said in its release.

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