According to most reservation sites, this is a 4 star. However, its location and the hotel itself, for most people, isn't as desirable as the Renaissance or Marriott. That's NYOP. What you are saying about the exchange rates isn't a mere theory, it's a fact. :-) Hotels in Germany calculate in € (usually including the 7% VAT). Your bid amount in $ is converted into €. Your bid amount of $65 comes up to $69.55 including VAT. I suppose, the lowest acceptable bid in this case was there €50 including VAT. You will have paid around €55 per night including all taxes. Still a savings of €30.