Hello, how I can book the overnight cruise Hangzhou and Suzhou? Thank you!

The ticket can only be bought at spot, but you can buy the tickets in advance at the ticket offices.
Here is a list of ticket office:
No. 8, Renmin Road;
No. 556, Renmin Road.
Hope the information can help you.

Is this office in SZ, HZ or SH?

It should be the office of Suzhou. In Hangzhou, you can buy the cruise tikcet and catch that at Wulinmen Water Bus Port.

Cruise isn;t cancelled?
Is it still operating?
Please tell me how to get to #8 renmin road.

For all I know, the cruise is still operating. Bus 27 and 94 can take you to the wharf. Or, you can hire a taxi to get there directly. However, I'm not sure the cruise schedule. You are suggested to consult the staff when you arriving at the wharf.