UCB has 2 campuses.
Cambrian Hall: cheapest 80GBP/week, share bathroom with one other.
The Maltings: each room with own bathroom, own bar, 10min walk, 88GBP/week, more modern.
Still have double rooms for couples, also for disabled, blind/deaf students
Residence furnished, but you might need to buy kitchen accessories.
You can also apply for private flat, not in the city center, will require bus-ride.
UCB offer roof-over-the-head guarantee.