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Bad news for London travelers: Not only are London hotels expensive, they're also reportedly among the world's worst.

At least, that's according to data from Trivago. What the heck is Trivago, you ask? It's a price-comparison hotel search site based in Germany and recently acquired by Expedia. The "Online Hotel Reputation Index" is based on 34 million travel reviews from 140 different sites (including such names as Expedia, Priceline and Hotels.com). Only hotels with a minimum of 60 reviews were considered, and a city needed to have at least 135 hotels to be included.

London came in last among the 100 cities ranked, but which city came in first? Dresden, Germany. Never been there? In second came Hanoi, Vietnam. And in No. 3, an American city: Portland, Ore.

Other cities that didn't fare well: Los Angeles, which came in at 91 of 100, and Paris. which came in at 97 out of 100. Following, a list of the 10 best and the 10 worst, according to Trivago.

The Best (1 - 10)

Dresden, Germany Hanoi, Vietnam Portland, Oregon Tokyo Santiago de Compostela, Spain Gdansk, Poland Chicago Seattle Krakow, Poland Budapest, Hungary

The Worst (91 - 100)

Los Angeles Kyiv, Ukraine Frankfurt, Germany Panama City, Panama Brussels, Belgium Amsterdam Paris Copenhagen, Denmark Rio de Janeiro, Brazil London