Benefits of coffee
Light, medium, dark, French-Roast, Colombian, store-bought, highend coffee shop--whatever your preference, we all know what coffee is and how delicious it is. I like my coffee with a majority percentage of chocolate, some milk/cream, and sugar. Yes, that's basically a chocolate drink, and it's delicious... :D It's versatile, too. You can use coffee in a drink, in desserts, on roast beef, and even on your skin.
Smooth, even skin
Coffee is a terrific exfoliate and, as long as the grounds get to soak in the oil for bit, it's gentle. Yes, there is a reason I know that. Ouch. Coffee is also loaded in antioxidants and can reduce the appearance of inflammation, puffiness, and redness when used in a scrub or mask. The antioxidants in coffee may even reduce the appearance of dark spots and other effects of sun damage.
Skin and eyes
Coffee is a natural source of tannins, which are an astringent. When combined with the caffeine in coffee, it can reduce the appearance of inflammation and dark circles/eye bags.
Allegedly, using brewed coffee on your hair can add a shine. I haven't tried it; but, I figure, what works for your skin could also be good for your hair--at least in principle. There are some necessary differences. According to Style Caster, you brew strong coffee, add a little water to thin it out a bit, let it cool to lukewarm, pour it over your hair and scalp, and wrap your hair for 20 minutes. Then, wash it out with warm water. If you do this, I suggest making it part of a full package deal. Fill the tub with hot water, before or after you treat your hair--your choice. Add a little bit of oil to the water, use a face and/or body scrub, apply a honey-based face mask (with or without coffee in it), and relax. When the time runs out, thoroughly rinse off. Then, experts recommend finishing off with a thin layer of a gentle, natural moisturizer for ultimate hydration of your skin. Honestly, I don't know if you're supposed to condition your hair at this point. I would say you should decide based on how your hair feels after you rinse it out. If it feels soft and smooth, awesome. If it feels a bit too dry, add a little bit of oil to a container of water, work the blend through your hair, then rinse again. I regularly use my body butters and bath/body oils in my hair. Lately, I prefer the light butter because it melts and absorbs so quickly, plus it's lighter and thinner than the regular butter.
Disclaimer: Per FDA regulations, I am not legally allowed to make claims about the anti-inflammatory properties a product may have. I can only say whether or not something may affect the appearance of said inflammation. Likewise, I am not allowed to list the benefits of antioxidants, caffeine, etc. in skincare, when those effects may be construed as drug claims. I encourage you to research all individual components and decide accordingly.