where to stay in Shanghai for 3 days?

You are suggested to go to Huaihai Rd, where many shopping malls are located and the price is reasonable.
Besides, for your 3-day visit, I’d like to give you some suggestion:
You can go to People’s Square, Yuyuan Garden, and Oriental Pearl Tower on the first day;
The second day you can spend on Zhujiajiao Water Town and then back to downtown for shopping;
Finally, you can enjoy the Bund and a cruise on Huangpu River.
Enjoy your time!