First, to set the context since this is one of my first reviews. 5' 10". I haven't really travelled all that much before. Overall I had a very good experience staying with them.
Green Hills is "old" as in the property has been around for a while 1997 but that really only dates the aesthetics for certain aspects most people may never be bothered by such as the elevators, carpet, chair upholstery, desks, location of electrical outlets and so on.
I stayed two nights, two single rooms (there with a friend) harbor-side with added breakfast. The bed was firm, there was no outlet on the built-in shelf above the bed.
There was little to no noise bleeding in from the harbor at night or I wasn't that bothered by it. The room was kept fairly clean and they gift a couple of bottles of water along with some mikan in jello. The breakfast buffet was filling and there should be sufficient enough variety. You aren't going to be expecting luxury but I think you're going to be fairly comfortable. Be careful when getting into the shower, the lip of the tub is some awkward height higher than whatever the standard American tub height is.