Take the AREX Express train from Incheon Airport that goes to Gongdeok Station directly.
Transfer to Line 6 and take the train towards Samgakji and don’t get off until you reach Cheonggu Station.
Get off at Cheonggu Station.
Come out of Exit 3.
Cross the crosswalk going towards KB bank. And then you will see a small road to the left of KB bank.
Go down that road and take the 1st left and keep walking until you see Kimchee Dongdaemun 2 Guesthouse.