While the majority of the staff are very friendly and helpful, there are employees who are poorly trained and don't show an acceptable level of customer orientation. Our booking by Expedia was split between the first and the remaining 5 nights. Although this was immediately realized by a trainee at check-in, we were later confronted by the Head Concierge (Ms. Hettler) and asked in an aggressive tone if we could prove that we had paid for the 5 nights. After it turned out that it was a glitch in the hotel's software, there was no single word of apology. When we complained about her behavior, the General Manager, Mr. Westheuser, sided with her and threatened to throw us out of the hotel. Although the latter didn't happen, this is not a way to treat customers, and we cannot recommend this hotel to anybody who is expecting a relaxed stay in this nice city.