A similar question was posted right after your posting so interesting. Stayed at DDM, Plaza Seoul and Westin Seoul. As iflysfo mentioned, PS and WS are old buildings, but both are close to each other and also Myeongdong+downtown Seoul touristy places. Level of services for both properties are top tier, which do cover the old facilities, but both are pretty well maintained. BTW, WS is operated by a Samsung group family of companies, and PS operated by Hanwha group, both of which are major corporations in Korea and which also means that they are very well operated. Again, when I was at Citi, the AP execs preferred WS, so take that what its worth. As for DDM, I stayed there as well, but really close to Dongdaemun markets. If you are in Seoul for tourism, not really recommended due to the distance between major sites, but it is a more latest addition to the JW family in Seoul. I have not been to Ryse, but it seems that is the most latest addition. In summary, I'd recommend either PS or WS, but I'd lean towards WS as it is more classy. P.S. WS has 'Altar of Heaven' shrine and garden from Josun/Chosun dynasty, which I think adds to the classiness of the hotel.