Why blocking one night before and after reservations? (just one night would be fine)
This is more a suggestion than a question. As it is now, if you want to have some time to prepare the apartment, you need to block two nights: one before and another after. I think that Airbnb could add two more options: (a) Block one night after each reservation, (b) Block one night before each reservation.
Go to "Manage Listing" then when the calendar shows up click on "settings". To the right you will see options for blocking dates after each reservation.