WiFi is free in public spaces. There's an onsite 24-hour business center. Hotel Gaon Golden Park Dongdaemun also features tour/ticket assistance, laundry facilities, and dry cleaning/laundry services.
It's just 3 mins from dongmyo station, and 9 minutes from Dongdaemun station for trains. Bus stop is just 3-5 mins walking. There's variety of food option. There's even a ghibli small cafe. Look for it!!