The quality and the type of beans
The blend of beans
The quantity of beans used in the preparation of coffee
The type of grind used to prepare the coffee
The freshness of the beans used
The quality of the water used
The type of roast (dark, light, etc.)
The temperature at which the coffee is brewed
The temperature at which the coffee is served
The age of the coffee after brewing
The cup that the coffee is served in
The cleanliness of the equipment in which the coffee is prepared and served
Flavored coffee vs. non-flavored coffee
Quality of coffee condiments