I did find the thread http://www.flyertalk.com/forum/asia/...tay-seoul.html but it doesn't have Priceline in the title.

I'm going to be in Seoul for the first time (by myself) from 10/28 to 11/1 for vacation and will try to rely on public transit.

Pricelines defines these zones:
Central Seoul
Gwangjin-Gu
Seocho-Gu - Gangnam-Gu
Yongsan-Gu [greyed out though, not sure why they list it]

I can't attach any images/screenshot here so that you can see how Priceline defines these zones.

Which of these zones are bad ideas to try bidding on? I'm looking for some place safe, clean, within walking distance of a subway station and preferably close to tourist attractions (but good subway access is good enough).

I'm not on any incredibly tight budget, but I'd like to keep it <$120 US/night. I don't need to stay at a Ritz Carlton or anything like that. Or, would bidding on Priceline in Seoul not save any money/not be a good value? (I've gotten awesome deals by bidding for rooms on Priceline in Portland, OR, Washington DC and Detroit, MI before.)

A Korean friend recommended http://www.tripadvisor.com/Hotel_Rev...oul-Seoul.html but it looks real spendy and they don't seem to have rooms available for some days of my stay.