We use Folger's French Roast. I like to use the different not so sweet flavored creamers like Hazelnut, Amaretto, and Bailey's Irish crème original (when I can find it). Others are too sweet. bitter to me is like having a bit of very dark chocolate. I'm good with it. A friend of mine uses a few grains of salt to neutralize any bitterness in her coffee. Like barely 1/8 tsp.