Information and Communications Technology (ICT) has an impact on nearly every aspect of people lives – from working or learning to socializing – and makes people lives easier and more comfortable. In particular, smart home devices can handle environmental characteristics (lighting, temperature, etc.) that can increase people comfort and can also help in reducing costs. In order to increase passenger comfort in the cruise ship cabins, this study proposes the design of an App that provides high quality products and services. Smart Home, Ambient Intelligence and IoT are the starting knowledge to create a smart space without re-designing all the cabin environments. The App brings real added value compared with existing domotic systems, because it does not consider only environmental characteristics but also personal features of the passengers and their activities. The aim of the proposed system is to improve passenger comfort in order to increase perceived quality, acting as a real time Decision Making System. The application receives information from various sensors and actuators and decides how to create a suitable environment and healthy space, according to the passenger preference and activity. The App follows both the necessity of the ship owner to increase passenger satisfaction and to reduce costs.