We have been optimizing for the nuclear family since the 1950s. Meanwhile, our demographics have diverged from that. This is part of the problem.

We have more singles, more childless couples and more single parents. Their housing needs are not being met. We expect young single people to rent an apartment designed for a family and get roommates.

If that works for you, that's already available. The assumption that someone with basic income should get a roommate is an assumption that they really aren't allowed to aspire to the same things as middle class people, like a space of their own.

A lot of women currently de facto use a romantic partner as a means to cover rent and it causes all kinds of problems. Expecting people to pair off to have a decent place is essentially expecting a polite form of prostitution.