I am a frequent visitor to Seoul and have tried numerous hotels, including the Shilla, Westin Chosun, COEX Intercontinental, Grand Intercontinental, JW Marriott, Hiilton (long time ago), Renaissance (yuck) and the Parky Hyatt. The Park Hyatt most recently.

My first recommendation is to choose a hotel close to where you have meetings. Traffic in Seoul is HORRIBLE and location trumps everything else.

Having said that, I was underwhelmed by the Park Hyatt. The entry to the hotel is basically a back alley. More than that, I found the high-tech room hard to master --- it needs a "user's manual." Lights pop on when you go to the bathroom automatically, there's a master light switch which makes everything either on or off and it seems to have a mind of its own... I got the hand of this on day 3 --- but it's a bit over the top. The minimalist layout of the room reminded me - believe it or not - of my dorm room at university.

Of the hotels I've stayed at, I prefer the Westin Chosun the most.