Thank you, Aventine, always appreciate your insights about Korea! Agree that even though PH Seoul is only a Cat 6, it's a strong redemption of a Cat 1-7 cert when taking into account revenue rates. Getting to the PH from GMP is easy enough, but the transfer to GH ICN doesn't sound straightforward -- limousine bus to the airport, then shuttle bus to the hotel? I guess a taxi would likely save an hour, but not sure of cost. Is staying at GH ICN a good idea on a Saturday night? I assume upgrades are hard to come by and the club (Grand Cafe?) will be overcrowded and require waits and/or signing up for a time slot?
As for the voco, agree that it probably has the best location for exploring (I spent a few months in Seoul years ago, but my travel companion has never been), and it would be a decent compromise that doesn't involve moving hotels. For a 9am departure, would probably have to leave the voco around 6am, so GH ICN would mean an extra hour of sleep -- although the hassle of moving hotels the prior night pretty much negates that benefit.