Coming from Italy, ‘cleanliness’ is the first impression. Most associate the city with music, the greats having come from here: Mozart, Haydn, Beethoven, Brahms, etc.. It is also the birthplace of Sigmund Freud. It was settled by the Celts, then fortified by the Romans, and has essentially been dynastic and opulent ever since. The home of the Hapsburgs, and the Hapsburg jewels. There are many great palaces, theatre halls, houses of parliament..all separated by fountains and parks and breath-taking views. Currently, it is the home of OPEC headquarters, the IAEA, and many United Nations branches. It is spy ground zero and the place they get their supplies, no doubt. I loved it; not as much as Berlin, but pretty close.