The City of Heidelberg turned out to be one of the most beautiful and fascinating places on our driving trip throughout Germany. Our Heidelberg Castle tour guide could not have been more interesting and responsible. From the very beginning, Katrin S., always promptly responded to our many emails, texts, and questions. She spoke fluent English and remained concerned about trying to accommodate our requests and obvious needs. She was so knowledgeable about all of Germany and especially this Castle. Anyone traveling to Germany on a vacation should make every effort to spend a day in Heidelberg with Katrin.