The IP Boutique Hotel is about a 5 minute walk from the Chabad House. The hotel's room doors are electronically operated but can be opened by hotel staff in order to avoid violating the rules of Shabbos.
Other tourist-class hotels within walking distance include the Hamilton Hotel, I.T.W. Hotel and the Mondrian Hotel. Please note that the Hotel Crown has two locations in Seoul. The Itaewon Location is the one near the Chabad House.