Although the healthcare sector has been hugely benefited from the advantages made in the Information and Communication Technology (ICT) domain in the recent years, the emerging technology breakthrough of the Internet-of-Things (IoT), in which all devices and services are collaborating while reducing human intervention, promises new solutions that will enable users to have a more home-centric healthcare, and a sustainable active and healthy ageing. This paper is proposing a smart-home IoT infrastructure for the support and extension of the independent living of older adults in their living environments that responds also to real needs of caregivers and public authorities. The proposed infrastructure seamlessly utilizes health and monitoring devices for the provision of a safe environment for an elderly, the mitigation of frailty and the preservation of quality of life and autonomy. It also provides a mechanism for easy setup and testing of the installed equipment and a decision support system that offers advanced data analytics and visual analytics mechanisms to the formal and informal caregivers of the elderly for the efficient monitoring of their health and activity status.