Beijing to Shanghai?

Walk from your hostel in BJ to Dongsi subway station to take metro line 6 to Pinganli Station, where transfer to line 4 to the South Train Station. There you can take the high-speed train to Shanghai.

You may arrive at Shanghai Hongqiao Railway Station. At this station, take subway line 10 to East Nanjing Road. Get out from exit 6 and you can walk to your Dock Bund hostel within 500-600m.