Just get the freshest and best coffee beans on the planet, and a very good grinder. Then you can make fabulous coffee with your grandmother's stockings.
I agree the coffee makes all the difference. However the preparation is also important. I like espresso but it hasn't replaced my simple single cup hand pour. That makes the best coffee for my tastes. I like the Aeropress but think the hand pour is still better. I'm not a big fan of the flavor of press pot coffee but will drink it that way from to time (used to be my go to preference.)
Anything is better than preground nasty hotel coffee.
I might have more in common with homoeccentricus than I care to admit.
I agree that process is also important. Since my espresso machine died (Gaggia Baby Class), I've been using an Aeropress. I think I've found a good balance between simplicity and flavor, the key being temperature. I think the same goes with press pot coffee. As homebrewers, we have cool tools on hand like a Thermapen. My Thermapen gets more use with coffee than beer these days.
Oh, and on roasters... I've been doing the hot air popcorn popper method for years. The volume is too low for hardcore drinkers, but it works.