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).