Abstract: Systems and methods are provided to generate an access code specific to a user of an online marketplace to use to enter a first accommodation during a first reservation time frame and a second accommodation during a second reservation time frame and to send the access code specific to the user to a computing device at the first accommodation and a computing device at the second accommodation to use to enter the first accommodation during the first reservation time period and the second accommodation during the second reservation time period. The access code is automatically removed from the computing device at the first accommodation and the computing device at the second accommodation at the end of the first reservation time period and at the end of the second reservation time period, respectively.

Abstract: A reusable modular housing system has a gridded structure comprising reusable components with dimensions corresponding to a two-unit system. The structure has floor and ceiling grids with dimensions that correspond to multiples of a first unit of measurement. The vertical beams that connect the floor and ceiling grids are spaced apart at dimensions that also correspond to multiples of the first unit of measurement. The structure has a variety of other components that can be coupled to the floor and ceiling grids and the vertical beams, and those other components have dimensions that correspond to a multiple of a second unit of measurement. Dimensions of the structure can vary, but each of the component parts can be detachably coupled into the gridded structure, so as to fit within the grid's dimensions based on respective multiples of the first unit of measurement and the second unit of measurement.