Can't be beat.
I have stayed in the Boardwalk Villas twice, once in a studio, and once in a two bedroom. The units are smaller than those at Old Key West, but then again, OKW isn't in the same place as Boardwalk is. The only problem that I encountered is that there is only one set of elevators, and if you happen to be at the end of the hall, good luck. It took us almost ten minutes to walk from our room, go down the elevators, and walk to the spot on the boardwalk under our room. The stairs don't help either, they exit to the back of the resort, and you must walk all the way around.
Both times, we had preferred view rooms that looked over the boardwalk. Our studio was under the "O" in Crest "O" the Waves. Great views of the boardwalk, EPCOT and Illuminations. The rooms are plenty big, have all the supplies, and are as nice as some of the Deluxe resorts where I have stayed. It is, by far, the funnest place to stay. My wife and I always stay there, unless we have the kids, and then we head over to OKW.
The pool is great, the location is great, and there is nothing like walking through the World Showcase before it opens. I am sure that you will enjoy it.
Have a great trip!