In recent years the number of ICT-based solutions for the Ambient/Active Assisted Living (AAL) has grown continuously. Such technologies need to be validated before being used on a large scale to help people to live independently and longer in their preferred environment. However, the testing of ICT solutions to manage smart homes requires huge resources, since the tests need to be conducted for a long time, with real human inhabitants, taking into account different kind of impairments and different economical conditions. In this paper, we present the use of a 3D simulator for the AAL: as a use case, we describe how the simulator can be used to interact with a real mobile application to manage a smart home, using the app to control a “virtual smart home”. Key words: Mobile Application, Ambient Assisted Living, Active Assisted Living, Virtual Environment, Smart Home