In an instructional guide, the process of building an Airbnb listing review app using MongoDB and Retool is detailed, aiming to enable users to approve or reject listings efficiently. The guide begins by setting up a MongoDB cluster with sample Airbnb data and connecting it to Retool, emphasizing the use of a connection string for data management. The app development involves creating a listings table with search and filter functionalities, utilizing MongoDB queries to manage data display. It also includes creating a detailed panel to review listings and their associated reviews, allowing for easy approval status management through a color-coded system. The guide concludes with adding logic and buttons for approving, rejecting, or marking listings as pending, ensuring that changes are reflected in real-time. Throughout, the guide highlights the use of Retool's graphical interface to simplify database interactions, offering a user-friendly solution that can be implemented swiftly, even by those with minimal coding experience.