Zurich
Zurich is one of the nicest cities that I had visited on this trip. Not only it has beautiful sceneries, the place is clean and well-organized. The transport infrastructure is really convenient, on time and efficient. People are also environmentally conscious and they take the effort to split or recycle their trash.
If there is one thing I don't like about Zurich or the other cities that I visited on this trip, it is the public toilets. One might need to pay up 2 Swiss franc just to use the public toilet!