We introduce the concept of "robot-rooms," where a small room physically reconfigures itself to create multiple, adaptable spaces. By integrating collaborative design and agile, rapid prototyping at room scale, our research explores how such environments could transform to meet diverse human needs. Through a co-design investigation including brain-storming, bodystorming, and interviews with 30 participants in 12 groups, we explore the potential configurations of a robot-room prototype with the following contributions: (1) understanding the design space for reconfigurable rooms, and (2) uncovering perspectives on the future of reconfigurable living environments. This research highlights the potential of reconfigurable spaces to enhance functionality, flexibility, and well-being in compact settings, offering a foundation for future exploration of adaptive, human-centered spaces and advancing the concept of human-machine cohabitation within HCI and HRI.