Hotel was ok, room was clean. To promenade is only few meters away there you have shops, restaurants, theme park. Island if we can say island it's small walkable, park is nice. Only not optimal is if you want to go to Incheon airport by public transport it takes around two hours to get there.
And little problem I had with reservation, receptor didn't found my reservation so he said I should cancel my reservation and do again. But after 10 minutes he said he found it. It was just weird for me I made more then 40 reservations through this site and never had one problem but now one reservation was missing. But everything was fine at the end.