I had a wonderful stay at Kaohsiung Marriott Hotel. Check-in went smooth and the staff are all really nice and helpful. I got a room on the 30th floor (thank you). But out of the 10 elevators only 4 of them go to the 30th floor. So I had a few times where I was a bit confused and took the wrong elevators before I finally got to my floor. After a few tries you get used to it though, just keep this in mind. The room was huge, clean and really nice. The spa and gym facilities on the 12th floor is must try if you stay at this hotel. I used them every day during my stay. I did not try any of the restaurants so I can not comment on the service and food here. I did have room service a few times, and the food here was great.
There is a shopping mall directly connected to the hotel if you like shopping. There is also a 7/11 on the other side of the street on the back side of the hotel (you can take a shortcut through the shopping mall when it is open). The hotel is also really close to both the red and green lines, so it is easy to get around. There are also taxis on standby outside the main entrance most of the time if you prefer that.