In my world, Rhino's have mutated and evolved to become larger than elephants.
Look at what is available for elephants, then. First thing that comes to mind is a howdah
A howdah, or houdah (Hindi: हौदा haudā, Bengali: হাওদা haoda), derived from the Arabic هودج (hawdaj), that means "bed carried by a camel", also known as hathi howdah (हाथी हौदा), is a carriage which is positioned on the back of an elephant, or occasionally some other animal such as a camel, used most often in the past to carry wealthy people or for use in hunting or warfare.
As a house is rather basic, a bit fancier and not larger than a capsule hotel room, probably. But it gives you shelter from the elements (provided you have something on the walls) and a surface to sleep and to reside. Forget about parties, though.