A flophouse or dosshouse is considered a derogatory term for a place that offers very low cost lodging, providing space to sleep and minimal amenities.

What does a flophouse look like?

Generally rooms are small, bathrooms are shared, and bedding is minimal, sometimes with mattresses or mats on the floor, or canvas sheets stretched between two horizontal beams creating a series of hammock like beds. People who make use of these places have often been called transients and have been between homes.

Where did the term flop house come from?

flophouse (n.)

"cheap hotel," hobo slang, 1904, probably related to slang flop (v.) "lie down for sleep" (1907); see flop (v.) + house (n.).