RVezy doesn't impose any requirements for minimum rental periods, however, hosts do have the ability to set a minimum number of nights in their listing.
This will prevent you from sending a booking request to the host unless your trip dates meet or exceed the minimum number of rental nights they have set.
If you want to ask the host if they'd make an exception for your request, you can send them a message using the Ask Host a Question feature. Some hosts might be willing to accommodate shorter stays at a higher nightly rate.