Asia - Where to stay - Seoul

Going to make a Priceline bid on Seoul hotel. On which of the following districts should I bid? No business there - just need a good/easy-to-get-to location:

1 Central Seoul

2 Gwangjin-Gu

3 Seocho-Gu - Gangnam-Gu

Going to make a Priceline bid on Seoul hotel. On which of the following districts should I bid? No business there - just need a good/easy-to-get-to location:

1 Central Seoul
2 Gwangjin-Gu
3 Seocho-Gu - Gangnam-Gu

#3 is my 1st preference - includes Coex complex, newer area, south of river
#1 is 2nd - if this is myeong-dong area, the older downtown area, north of river
#1 is way out east, near Sheraton Walker Hill and not close to anything - i would not bid for anything here!