Location. Near the airport, Grampus Inn Osaka is located in Osaka's Namba neighborhood and close to Osaka Prefectural Gymnasium, Grand Cube Osaka, and Osaka Public Nakanoshima Library. Nearby points of interest also include Osaka Castle and Shinsaibashi Shopping Arcade. Hotel Features. Grampus Inn Osaka features an elevator (lift). Complimentary wireless Internet access is available in public areas. Guestrooms. 41 air conditioned guestrooms at Grampus Inn Osaka feature coffee/tea makers and bathrobes. Wireless Internet access is complimentary. Notifications:The Japanese Ministry of Health, Labour, and Welfare requires all international visitors to submit their passport number and nationality when registering at any lodging facility (inns, hotels, motels, etc. ). Additionally, lodging proprietors are required to photocopy passports for all registering guests and keep the photocopy on file.