Your best bets in Oak Park are not technically in Oak Park, as suggested above: Gaetano's, Amarind, Cafe Laguardia West, Freddy's, The Depot, Wishbone, Xni-Pec.
Right in town (especially near the Green Line), Papaspiros or Hemmingway's [sic] Bistro may be your best bets. Papaspiros does some things very well (loukaniko, spanakopita, saganaki, gyros) and others very poorly (lamb shank, avgolemono, moussaka, dolmades). Hemmingway's is a sedate room with good service; go towards the Provencal or Moroccan offerings instead of the standards if you want some extra care from the chef.
Cafe le Coq is really closed, sadly. Your other options in that immediate vicinity are Maya del Sol (room is great and select dishes are good, see existing thread), Fuego Loco for Tejano corporate-Mex (but at least five house-made salsas and hot chips, can't go wrong), and maybe Pasta Shoppe if the new Neapolitan pizza is any good. Their pastas can be excellent; stay away from the main-dish meats and fish, through, as those are consistently overcooked and underseasoned.
If you wanted to do Blue Line instead of Green Line, Trattoria 221 is a thought. Wood-fired pizzas and grilled pork tenderloin and octopus are favorites there, but pastas, sides, and desserts are underwhelming. Good luck!