Always use cold filtered water when brewing coffee.
Never reuse grinds (except for composting)
Make sure that your brewer/espresso machine is operating at the proper temperature (not having the proper temperature can drastically change the flavor of your beverage).
Keep your equipment clean and well-maintained.
Keep your coffee/espresso beans stored in a cool, dry place.
Beans are roasted many different ways...but beans are beans and it's how you extract the flavor that distinguishes coffee from espresso.