This comes directly from the Wisconsin Apple Grower Association Cookbook.

• Store small quantities in your refrigerator, in vented plastic bags in the crisper – between 34 and 40 degrees Fahrenheit. Don’t allow them to freeze.
• Because apples can absorb odors from other foods stored in the same area, keep apples in plastic bags. The plastic also helps retain their own moisture.
• Apples ripe six to ten times faster at room temperature than when refrigerator. One or two days sitting on your countertop and the fresh crunch of your apple is lost forever.
• Dipping cut apples in lemon juice helps prevent apple discoloration.
• Baked apples in the microwave are quick and easy.
• Spread apple slices with peanut butter for an easy children’s snack; or dip slice in honey and roll in granola.