The theme can work for a single property. You can disable submit for other people and manage this property with an user of your own.
Steps to get you started:
1. You install a demo –
You delete all demo properties – owners – blog posts from admin (but this way you keep the pages and theme options and save time).
2. You fill in your profile information (go to page My Profile) and add your details.
Even if you are the site admin, you must use front end submission to add listings and fill in your profile information for profile details to be displayed on properties.
3. You add your properties with that account
Add listings only using the front end submit form to have access to all options for a property.
Manage what fields to show in submit form from admin – theme options – https://help.wprentals.org/article/1-30-how-to-manage-submit-form-fields-and-mandatory-fields/
If you added properties as admin you can edit them and assigned them to another owner from admin.
Edit from Admin -> Listings -> Edit Listing -> Owner responsible
4. You go in theme Options and add your username to be the sole owner
You hide the Submit Property button
Go to Theme Options -> Header -> Show Submit Listing Button -> NO and Save Changes.