As a surprise gift for my husband's birthday, I booked the tour to Teufelsberg. That it was such a wonderful and unforgettable morning, we have to thank Stephi, who drove us with her charming, open and warm manner to the Teufelsberg (and incidentally is an admirably relaxed driver!). We got a lot of interesting background and insider knowledge, to each of our questions Stephi had an answer or idea. You can tell that she is not only very well informed and networked, but also researches a lot herself out of her own interest, tries things out and has very creative ideas. The fact that Stephi made this very exclusive tour possible for two of us also shows her flexibility and service orientation. We can unreservedly recommend Secret Tours. Keep up the good work dear Stephi, you and your concept - you are absolutely coherent!