Hi @Danielle1864
It's possible to rent only from one specific day of the week (eg. Friday to Friday) - you can set up a rule in Professional Hosting Tools and apply it to the date range of your choice.
The question is more - as you're also wondering - what set-up will work best for you. It may be hard to fill your whole summer with back-to-back guests who all happen to want to stay exactly 7 nights from Friday to Friday. It should be easier to fill up with just a straightforward minimum stay - of course, the shorter the easier. The problem with just a regular minimum stay is that there will almost always be gaps between bookings, which you'll then have to fill with shorter stays if you want to be booked up.
I usually start with strict best-case rules (minimum stays and days of the week that I don't want changeovers). As the time comes closer, I fill the gaps and relax the rules and prices as much as needed. This can be nerve-wracking if you're determined to fill every night. So if you're someone who likes to be booked up in advance and you want to plan your summer ahead, it may be better to set looser restrictions from the start. Hope it makes sense!