Indian Head Park, Illinois, population about 3700, intersection of I-55 and 294 west of Chicago.

I like it because - it's close to everything Chicago has to offer
It's small enough that if I need the police or fire department really quickly, they're there in less than 5 minutes
There are some huge, beautiful old trees
It's got a great park just two blocks from my building
My parents, brother and family, and sister and family live less than 10 miles away
It's close to commuter rail and the tollway
It's just a good town

On a bigger note- I love living in Chicago for
90 degree days with 90 percent humidity
freezing cold days with below-zero wind chills
the Art Institute, the Chicago Symphony, Second City
the Cubs, the Blackhawks, the Bulls
Chicago pizza and hot dogs (no catsup!)
Lake Michigan
I don't like traffic jams, winter storms, summer storms or corrupt politicians, though.

Edited to add: if I ever get enough money to retire I'm moving down by Kokopup! It sounds lovely there!