We have stayed in Congress Park and Grandstand - LOVED both. CP was us alone and GS was with our kids. The room was newer in the GS and the first on and off the bus was a plus for the kids.
At CP we utilized the walking path to DTD several times and thought the walk was pleasant even at the end of July. I think there might be a playground there, but we did not notice one.
Both had beautiful views, (GS golf course/courtyard and CP was DTD) and were fairly close to the main area - GS perhaps a little closer. Both have their own "quiet" pool (GS has a water play area, too). Just wonderful places!!
If we were going again, I would probably request to be in either of the two hoping to get one of them.
I did notice that often times since the Springs was the last bus stop, people either had to wait for the next bus or stand. It is the section in the heart of the action though.
HTH