My coffee is normally used up within 1 week and is of unknown age on purchase, do I need to do anything extra to make it last a week?
If you use your whole beans within a week it's probably not worth storing it in the refrigerator or freezer. Coffee beans should be stored in a cool, dry place. They can last 1-3 weeks in your pantry. Ideally you should store them in an airtight opaque container. They degrade quickly in the presence of light, heat, or oxygen.
If you want to store them longer, then they will last 3-4 month in the freezer.
I have typically seen most rules of thumb for this being along the lines of buy only the coffee you will use within 1 week (kept at room-temp). freezing coffee breaks down the oils that make it flavorful, refrigerating it traps it with a bunch of other smells. storage of coffee is like that of produce, just have the right amount on hand; especially for high quality.
Basically, buy 1) appropriate portions and 2) keep it in a vacuum sealed container.
*note: if you buy locally roasted coffee/coffee with a roast date the peak flavor is typically within the first two days of roasting, and some (myself included) prefer the brown bag the coffee comes in to allow for the coffee to breathe during this period
Do not store coffee in a refrigerator for daily use. The repeated opening and closing of the container at lower than room temperatures will cause condensation on the inside of the can and on the beans themselves, degrading the flavor. I echo the other responses about using an air tight lid at room temperature. This should keep whole beans fresh for longer than a week.