Korea - Seoul hotels

Anyone have an experience with Sheraton D Cube hotel or Lotte City Mapo? It's my first visit to Seoul and the hotels are priced reasonably and get good reviews. Anyone stay in these before? Looking for a good base for a few days to explore and something easy to/from airport.

http://www.flyertalk.com/forum/starwood-preferred-guest/1089328-sheraton-seoul-d-cube-city-hotel-opened-sept-2011-master-thread.html

http://www.flyertalk.com/forum/hotel-deals/1293354-expired-sheraton-seoul-d-cube-city-hotel-28-night-usd-orbitz.html

one thing you'll want to consider is how far away the hotels are from the major areas in seoul - the lotte is a bit closer, but both are near major subways so at least you have that going for you. don't worry as much about the airport as there are tons of options (bus / subway) for getting back to the airport from many parts of the city.