The Zwinger was a great experience and the city tour (1.5 hours in total length) was great. Past all the beautiful sights. However, the organization can be expanded. I don't understand why you don't get the codes on your cell phone. You first have to go to the post office to exchange the ticket for a printed version. So we still had to buy tram tickets and the paper could be saved.

When we exchanged the tickets, we were told that the associated guided tour of the old town and the night watchman tour can be booked later. Unfortunately, everything was already fully booked that day, so we had to postpone this to the next day, which we found out later from another employee. He had informed us that these two tours should have been booked at the same time. The tour of the old town was very informative and he did a great job. The night watchman tour however, well. There was no one at the meeting point. We thought it would be canceled due to the rain, but then we saw a night watchman on Theaterplatz with another 26 people and joined us there. This person didn't do great at all. He kept talking in the other direction where no one was, spoke very slurred, etc. We and other people found it so horrible that we left after about 30 minutes. The positive was the tour

Very nice saleswomen, but you have to decide for yourself what you want to do. In the late afternoon the bus ride so you can get an overview. The next day an early tour, then not so many people are out. The night watchman tour is highly recommended because other things are told here.