Just like the pros and cons of all foods and drinks, moderation determines how beneficial or harmful something can be. Specifically with coffee, caffeine is the "big bad guy" if you drink a significant amount of it or if you're one of those people that has bad side effects from it (shaking, nervousness, etc.).
Something they don't mention in this article is that you should make sure you're drinking enough water during the day so that you're not dehydrated while drinking coffee. Coffee is a natural diuretic so if your not hydrated enough, excessive coffee consumption could lead to symptoms such as constipation and lethargy. But as long as you re hydrated and have coffee in moderation than there's nothing wrong with daily habit. http://www.qualityhealth.com/featured-article-segment?fa=105856&rf=45458&mc=&ct=36917
The first benefit of coffee they list is it lowers your risk for diabetes and in turn dementia and Parkinson's, when limited to 1-2 cups a day. I've read elsewhere that serious coffee drinkers (3-6 cups a day) also have this lowered risk, as long as they don't put sugar and heavy creamer in their coffee.
I've noticed that not everyone makes this next connection. Drinking more than a moderate amount of coffee each day could increase your risk of diabetes if you drink it with sugar and lots of creamer. This is only one contributor to how many calories and what kinds of food you eat overall. Your entire lifestyle influences your your risk for diabetes, heart disease, cancer and a myriad of other illnesses.
So, the small lesson from this is to lighten the load of additives you add to your cup of coffee. Coffee is extremely low in calories by itself, but most people can't drink it black. Instead of sugar use a form of zero calorie, or just low calorie sweetener. When it comes to creamer, use sugar free coffee creamer (less calories) and only use the serving size listed. Milk and other milk substitutes like coconut, almond or soy milk have even less calories than creamer and have no cholesterol.
Also, better tasting, better quality coffee needs less stuff added to it to taste good. So, choose a coffee you like. Personally, I like really bold/dark coffees.