My husband and I only had one day in Frankfurt and it happened to be a Sunday, when all the shops are closed. The walking tour that we were lucky enough to book with Holgen turned out to be the highlight of the trip. Holgen was passionate, knowledgeable, personable and funny. His love for his country and the city was palpable. He welcomed questions and offered relevant suggestions about places to eat, visit, and explore beyond the tour. This was definitely our best walking tour!