Smart spaces are equipped with a large number of sensors and actuators. Data measured by the sensors is sent to respective services, which can react on them and control actuators correspondingly. In order to improve the services and make them smarter, they can communicate with each other and exchange data. The more interferences between the services exist, the more complex is the monitoring and extension of such smart spaces. In this paper, we propose a monitoring tool for these environments, which consists of a real and a virtual component. The real component is the physical smart space itself and the virtual one consists of a three-dimensional model of the space. Sensor information is transmitted from the real to the virtual component and represented there, via an appropriate visualization. Additionally, the tool offers a communication channel from the virtual component to the real counterpart to control the physical actuators.