hello, I do not know which station to choose in shangai, nanjin and hangzhou.

the hotel in Shanghai is close to Shanghai Railway Station, and you can reach the station by subway line 1 from the hotel.
In hangzhou, the hotel is close to Hangzhou Railway Station, and subway line 1 can get you from the hotel to the railway station.
the hotel in Nanjing is near the Nanjing Railway Station, and there is also subway line 1 connecting the hotel and the station.
all the three stations have bullet trains to each other.