It's a great location for exploring Seoul. The buffet breakfast is amazing. Also, if you stay for a long time, they make a washing machine and dryer available (we recommend using the washing machine, then doing the drying in the launderette across the road, as it is much quicker).
We also recommend buying a climate card for the Seoul underground and buses, but be aware that you buy the card in one place, then top it up in a standard machine in an underground station, which only takes small notes, and credit cards issued in Korea!