Stayed 1 night for a long layover between flights. Easily accessible from the Airport via subway, I took the AREX to Unseo Station, and walked about 15 minutes to the Guesthouse. Guesthouse Ko In is in a quiet area not too far from the train station. Lots of places to eat or get coffee nearby. Check in staff were kind and friendly, and showed me how to change the lock code on my door. If you have luggage, I'd highly recommend an uber or taxi.