The KKVV App is an application for landlords and tenants. KKVV is a complete online management system for landlords. The KKVV App is part of this system and this app ensures that landlords and tenants can communicate easily with each other. Thus, with the app: * Are recorded, the level of delivery of the living area; * Information about the property to be inspected; * Tenants can file complaints; * Landlords can appeal to their tenants; * Cleaning and caretakers can check and completed forms;