Hey!
Interesting focus of your project. However, at least based on my experience, I don't agree with the problems you problem you outlined on your website. There are existing platforms like booking.com and others, which serve as a middleman between travellers and hotels. On booking.com I can easily and quickly book a hotel and also pay for it using paypal. What benefit does WHO provide that will drive the adoption?
Also, you may want to take a look at the german translation on your webiste..