The Bund, French Concession, and Pudong; Tianzifang and Xintiandi. Metro excellent; walkable pockets. Humid summer; pleasant spring and fall.
Xiaolongbao, shengjianbao, and red braised pork define dining. International and local. Most cosmopolitan Chinese city.
TopTenAtlas lists help you choose where to eat, stay, and explore. Suzhou, Hangzhou, and water towns round out a stay.