The study focuses on service co-creation in the sharing economy, where platform operators mediate the relationship between customers and potential service providers. Service co-creation consists of information sharing, interaction, and responsible behavior that customers undertake voluntarily or willingly to create an experience of value. Based on S-D logic, a theoretical model of service co-creation was developed and tested through structural equation modeling using survey data from 627 respondents in Sydney, Australia. The results provide strong empirical support for the hypothesized relationships between service co-creation, its determinants and impact on customer satisfaction. The implications on theory development and for property owners and platform operators are discussed.