Just got out of an initial interview with a Chinese lab. I was nervous at even the thought of moving that far, but they showed more interest in hiring me than any American lab (probably because Americans have no money for science). I'm setting up a time to present my research to them.
It's been really hard to find work, so while I'm nervous at the prospect of going somewhere so (supposedly) different, I hope this goes well.
Hangzhou is really nice to visit…I have friends living there that think it's a little boring, but different strokes and all that. Overall I'd say go for it! You aren't even that far from Shanghai, it's possible to live in Shanghai and commute to Hangzhou by subway/train in like < 1 hour, so if you find you don't like living in HZ, you could move to SH (if you don't mind the commute).