@Ashley2365
There used to be an option to set a weekly price,even for specific weeks, but is is discontinued long ago.
You can set a price per night and set min. stay to 7 nights to only attract stays of 7 nights or longer.
You can add a weekly discount, if desired.
Using rulesets even give more options to tune your offer regarding lenght of stay or limited check-in / check-out days.
You can also limit the price per night to a specific maximum of guests.
Guests above this maximum pay an extra fee (the fee which is set for additional guests).