I stayed at Co-op Residence Uljiro (Euljiro)...
I stayed at Co-op Residence Uljiro (Euljiro) from 22 Dec to 24 Dec with a friend of mine. The twin sharing room is cosy and the place is just nice for both of us. However, if you're used to a more spacious room, you might want to book the suite instead. The room is well equipped with facilities as those listed on the net.
One reason I chose the co-op is it's value for money, especially so if you're on a budget trip and just needed a place to rest and sleep. Another plus point is that it's just a stone throw away to the Dongdaemun Stadium subway and the Dongdaemun shopping area. Checking in and out of the residence is a breeze, and the staffs are relatively friendly and helpful at all times.
However, needed some help in getting to the residence by taxi. Some useful tips, 1) tell the taxi driver it's along Euljiro, as spelt with a "E", that's what's being used in Korea's signboard, 2) it's directly opposite the National Medical centre, a more obvious building around the vicinity, or if not, 3) ask the taxi driver to drop you off somewhere near to the dongdaemun stadium subway, just need to walk a few metres to the residence.