Cheap and cozy private-room nearby the subway line 2 and line 7.
It takes about 30 mins to get to both of Hongdae and Gangnam. Also, the aiport bus-stop is 10 mins far from here on foot.
Right nearby here, there is a huge business complex, called Guro digital complex. So lots of cuisine, restaurant and facilities are located.
Plus, with the subway line 2, you can go easily anywhere of Seoul. Line 2 is the most convenient way to hang around Seoul.