Like to go to Nanjing for 2 to 3 days. what are the places to see and where to stay for good times?

Oh, you can arrange the tour in the following way.
Day 1: Dr. Sun Yat-sen's Mausoleum, Qinhuai River
Day 2: City Wall, Presidential Palace, Xinjiekou
Day 3: Purple Mountain and the Observatory on the mount

About the accommodation, you are suggested to stay at Xinjiekou Area. Orange Hotel Select (Yet-sun Bridge) is a good choice for you. The price is about CNY 250 to 300 per night. It provides comfortable living environment and warm service. And the surrounding transportation is convenient. The address is No.472 East Zhongshan Road. Hope you like.