I was on the 6th floor and had perfect (the usual Korean speed) wi-fi internet; in fact there were no wires in my room.
The staff was very friendly and more than willing to help me get to my destinations in Seoul using public transportation (usually through subway line 9 at Gayang station, which is the closest to the hotel) during my stay, no matter where I wanted to go. The front staff is generally multilingual (as this hotel is visited by foreigners more than Koreans), and will provide you with whatever you need.
I stayed in the one-bed room, and while the bed was a little on the "hard" side, it was comfortable enough and provided good rest (but I was also exhausted from everything else related to travel so...). It can get pretty loud until... 9PM (because there is a bar lounge on the 8th floor). After 9PM, it's DEAD quiet (although the hotel is in a busy street corner of the city). I found it amazing that it could be this quiet in a city hotel.
The food served at the restaurant is very clean, tasteful, and reasonably priced for a hotel. They also provide discounts on the food served at the hotel restaurant (on the first floor usually during lunch time) for those staying at the hotel.
The water in the refrigerator is complementary, and you do not get charged for drinking the water in the hotel room, a very nice change.
I highly recommend this place, and will be staying here again when I come back to Seoul!