We just stayed there about 3 weeks ago. It was really nice. It kind of surprised me a bit. We usually stay at the DVC resorts, so we are just used to the size, style, and theming of them. We stayed at POP Century through a vacation promotion and free dining plan.
The rooms are your normal hotel rooms (think Holiday Inn or Days Inn), but have Mickey bedspreads on them. The theming of the place in really neat in all the different decades. There are trivia signs all throughout the property of things that happened in specific years.
But, here is what surprised me and liked about it. The lobby is really nice and has a lot of toys from the past few decades all over it. The souvenier store and food court is integrated and always busy. Same with the pools. There is a big arcade, too. Even at 11pm at night, the place is hopping with people in the shop/food court, pools, and tables around the area. Made it nice to come back to a fun atmosphere after a long day at the park.
Don't know about bus transportation. We drove. The parking is really far from the rooms in a lot of buildings, so getting your luggage to it can be a pain.
So, if was a pretty nice place to stay and a lot of fun.