Lol, coffee is one of those things that nobody can agree on. It has its pros & cons. Best I can tell, the biggest problem with coffee is the caffeine. Caffeine being a diuretic strips your body of valuable Water content.
The big debate is, "does the liquid content in coffee offset the the water loss from the caffeine?". Some studies say yes, some say no.
My personal "common sense" conclusion would be something like this
De caffeinated = perfectly fine, even counts toward your daily hydration requirements
Regular(house blends)= OK. But do not count it toward your hydration goals, as the caffeine likely strips your body of as much water as the cup contains.
High caffeine(espresso, Cuban coffee, etc) = you'll need additional hydration as there is not enough water content in these to offset the caffeine.
Another thing to consider is what you add to your coffee. Sugar, cream, cocoa, caramel, etc. make sure you are accounting for all those extra calories.