I made two bookings using Trivago in the past several months. Trivago does a good job of a search engine by gathering data, but does not make it clear that some of those third party hotel booking search results are foreign companies. Booking.com is one of those, based in the UK. Booking.com has a loosely worded "guarantee" for its lowest price, which you will not be able to dispute. It only guarantees the price is the lowest at the time of booking, and disallows any non-refundable bookings, which of course, all or most of their offers are. Therefore their "guaranteed lowest price" is not worth anything. I noted that the room price changed on my booking through them to a lower amount for my selected hotel the next day, but couldn't change my reservation without forfeiting my paid charge. From this bad experience, I learned that I could beat the hotel rates shown on the Trivago search by calling the hotel direct and negotiating with them instead of using this third party booking company. Read the numerous complaints on Booking.com before using them. Trivago would do well to provide a clear option to avoid foreign booking companies.