On our first trip to WDW, last October, we stayed in Pop Century and had a wonderful time. By chance we wound up in room 1138, which is a super-good omen for Star Wars nerds like ourselves! Our room was on the ground floor, just one door away from the parking lot, and about as far from the nearest pool as it is from the main building.
Others have talked about the size of the room and the bathroom, so I will not throw in my two cents there. I will say that soundproofing held up to everything except the Friday morning lawncare, the air conditioning was quick and quiet, and I was surprised to see that we had neighbors on two of our three walls. I'd never heard them while inside the room, and I'm a light sleeper!
One person in our party loved the Pop Century cafeteria so much that we've already agreed to eat breakfast there at least once the next time we stay, even if that means getting up super-early to make the bus trips and still have most of a day at a park.
We also used the laundromat over by the pool one night. It didn't cost us an arm and a leg, the machines were all clean and in good working order, a LOT of clothes fit into one load, and the dryer got things dry in one cycle without any damage.