Despite the key role played by frequent consumers interacting on smart P2P (peer to peer) tourism platforms, there are hardly any studies on the explanatory variables of their frequency of use. This paper aims to understand the motivational and sociodemographic factors that bring about repeat consumers in collaborative accommodation and transport services. In order to test various assumptions, a set of logistic regressions were made where the dependent variable is the frequency of use and the independent variables are sociodemographic and motivational factors. The results suggest that many consumer attributes recognized as being typical of collaborative platforms, such as young people traveling with friends for leisure who are interested in low prices, have changed. We found that, due to the consolidation of these smart business models, the frequency of use increases with age and for those who travel for work reasons. In addition, it is worth noting the existence of a positive relationship between consumers who provide reviews on these platforms and their frequency of use.Sustainability 2019, 11, 7082 2 of 13 company in the "Global 500 Rankings 2019" [7] with the highest brand value, ranking above Marriott International, the world's hotel leader. In addition, it has managed to overtake Booking.com, one of the main online hosting booking platforms [8]. Uber's fleet in New York is now three-fold larger than the number of yellow taxis [2].This sustained growth contradicts initial perceptions that these were temporary business models, aimed at a young audience, which were hardly going to be able to compete with traditional tourist services. The contextual factors that contributed to the rapid development of this business model, such as the globalization of society caused by the Internet [9-11], the boost from millennials [2,12,13], and the global economic crisis that favored the reuse of resources [14] are less influential now. Therefore, no one doubts that collaborative tourism is here to stay and will continue to grow [5,15].The consolidation of these smart tourism business models has been supported by the highest degree of satisfaction and recommendation of these services versus the traditional ones [16,17]. Both domestic [18] and European studies [5] show the greatest tendency for users to recommend collaborative platforms.Smart P2P tourism platforms are adapting their products to better fit the needs of consumers than traditional services, which creates the perception of quality and thus increases its frequency of use [12,[19][20][21][22]. This increased frequency of use causes greater confidence in the product and service [23][24][25], which is particularly relevant, since consumer insecurity and mistrust have been established as some of the most important reasons for the non-use of collaborative platforms [22,26,27]. In addition, the frequency of use is usually related to the service recommendation (e-wom) [28][29][30][31].Despite the success of these smart models, there are few studies focused on P2P accommod...