Spent a week here at the end of November. To be honest, it wasn't my first choice (Doulos Hotel was booked up).
First the good:
* The room is large (especially by Korean standards). Even the bathroom is huge.
* Very quiet, we never heard any sounds from any other rooms (we were in room 701)
* Ondol heating (under the floor) was quite nice
* Hardwood floors
* Computer in the room with broadband. Annoyingly, it was WinXP with Korean as the default language, so I needed to install Firefox to get English. Unfortunately, there's no wifi, nor could I find any way to get my laptop online (using the cat5 from the computer)
* Complimentary breakfast buffet every morning (7AM-9AM). Consisted of hard boiled eggs, rice, pork products, fried potatoes, miso, creamed soup, mini salad, juice/coffee/tea, toast
* Loads of complimentary items in the room (coffee, tea, bottled water, shampoo, soap, toothbrush, etc)
The not so good:
* The beds were, by far, the hardest, rockiest beds i've ever slept on. I go camping quite often, and sleeping on the ground is literally more comfortable than these beds. They were beyond uncomfortable.
* The location is kinda crappy unless you're planning to do something in the immediate vicinity. Trying to get just about anywhere (by subway) always required transferring at least once to another line, and just about nothing of interest to tourists is within walking distance. Also, the subway/metro directions on the hotel website are horribly out of date. Do not take line 5, or you'll be stuck walking for nearly 30 minutes. Line 9, National Assembly station, exit 1 is a 5 minute walk from the hotel.
Overall, the place was fine. I'd certainly be willing to try it again if there were no other options available at the time.