Here's my recipe for a perfect cup of coffee from a single-serving French press. I use darker roasts with my press, because you get a thick, rich cup of coffee from it.
Place just enough coffee in the press to fill the space between the strainer when it's pressed down and the bottom of the glass. This is about 3/4" on my Bodum. Coarse-ground coffee if you can, but I find a normal grind isn't the end of the world.
Bring cold, clean water to a boil. Then let it cool for a few seconds, just until you don't hear it boiling in the kettle anymore.
Fill the press about 1/4 full, and stir. Let it sit for 15-30 seconds, stir once to break up the head of foam.
Fill the rest of the way with just enough water to put the strainer on without pushing water out of the glass; stir once or twice before you actually put the strainer on though.
Let it sit undisturbed for three minutes. In the meantime, fill your coffee mug with hot water; I leave the stirring spoon in here.
Lightly stir the coffee once or twice, and then let it sit another three minutes.
Gently plunge the strainer. Just use the weight of your hand, really; the more force you use, the more grit you'll get.
Pour the hot water out of your mug, and then pour your coffee. Enjoy!