If you wish to use your things yourself and therefore know you can't rent it out, you can easily block the days on each individual ad in the app.
Go to your profile and select "Block days". Then you select all the ads you wish to block the days for. Click the green button saying "Select dates" where you then select the days from the calendar view.
Alternatively you can go to "Listings" and then select the ad for the item you wish to change availability for. Under "Blocked days" you can remove and add days.
This feature is only available in our app.