The beds are the best at Disney, IMO. The only ones we have found to be comparable were at BWV (at a much higher price). We liked the CSR beds much better than Poly, OKW, BC and AKL and have slept great at CSR every trip.
We haven't stayed at CSR since the free Wi-Fi started, but it seems to depend very much on your room location. It seems the Casitas have better coverage. They are closer to the convention center - not sure if that is why the coverage seems to be better.