The listing in question does fit the definition of a flophouse, per your Wikipedia link [1]. It might not fully match the traditional conception of a flophouse,

The listing in question does fit the definition of a flophouse, per your Wikipedia link [1]. It might not fully match the traditional conception of a flophouse, but it seems fair to call it one. [1] "flophouses...have been used for overnight lodging by those who needed the lowest cost alternative to staying with others, shelters or sleeping outside. Generally rooms are small, bathrooms are shared, and bedding is minimal..."