I have been very pleased with Gemut, based near Seattle. They deal with all the major car rental companies in Germany and Austria. Rates are very competitive and their customer service is excellent. This past summer I had to cancel a rental due to a family emergency, and they refunded the amount to my credit card promptly and without hassle.
I agree, the service from gemut.com is excellent. They also have good info on all aspects of travel in Germany.
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