Hello. New member here -- and almost a noobie to the world of cycling. It's been decades since I owned my last bike..

I was thinking of doing some casual cycling and decided to look into used bikes. Something not too difficult to ride for a beginner with decent performance, comfort and reliability.
I was wondering how something like this would fare?

http://seoul.craigslist.co.kr/bik/3869665260.html

I don't have much knowledge about buying used bikes, so if anyone can share pointers and things I should be cautious about, it would be much much appreciated!