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Several applications and services have been developed over the latest years for making houses smarter in terms of danger prevention, energy consumption, waste recycling, environmental monitoring and other life improvement implementations. Internet-of-Things (IoT) gave numerous possibilities decentralizing the control of smart homes. Numerous sensors and developed systems or services can all communicate via smart devices like smartphones. A continuously broaden interest arises from local and national authorities for the benefits of applying IoT strategies in whole cities. With main focus on energy and water consumption, cities can reduce significantly their costs and become environmentally and economically sustainable. In the transition from smart homes to smart cities serious challenges should be take into consideration including a human-centric approach and the beneficiary involvement of the citizens for local and national authorities. The design of an IoT strategy for smart cities is a multifaceted procedure which includes the study of economic, urban, demographic and geographical indicators. In this paper, empirical evidence from selected case studies are presented.