Seems like an okay hotel, but I ended up moving after 10 nights. The service isn't up to par with other Marriott's in Seoul, but I still think this is a nice hotel if you can get a good deal.
Anyways, I don't want to be overly critical.
Concierge in lobby was wonderful, but I guess there was a bit of a language barrier everywhere else (executive lounge, room service, laundry,etc), all of which made me feel like I was better suited towards a different property. The locals seemed to enjoy the property, though.