My son and girlfriend were in halls second year because of COVID restrictions. The other five rooms in their flat were Chinese students. They never stayed more than a couple of months. Never cleaned, washed up, spoke to them. They took over the common room on the ground floor, believe me no other students venturing into their space.
Son would phone housekeeping, hey there's a god awful mess in the kitchen here here student in flat x room x. They came in to clean no questions asked god knows where the students vanished to.
They never spoke a word of English that son heard. How on earth did the lecturers cope.
The good thing about them was they spent an absolute fortune in the city. Harvey Nichols and other upmarket stores did very well.