Things seem to have become more difficult to obtain in some cases. Back in 2003, nobody asked me for proof of income for renting. Just basic credit checks (which don't directly know about income or bank balances). Proof of income is more recent.
(And difficult if you're self-employed with highly irregular income, I found.)
If using a guarantor, a guarantor has to pass similar checks.
Guarantor works a lot better for a young person starting out in a cheap-ass room in a shared place, whose parents expect this. For a flat and an older adult with retired parents on a low pension, or their own housing costs, not so much.
Good like finding a guarantor if your parents or friends:
- don't have enough spare income to cover your rent in addition to their own expenses
- don't pass the credit check themselves
- can't pass the proof-of-income check themselves
- don't have enough assets to use as security
- are not happy using their assets as security for you (e.g. their limited life savings or their one and only home)
Some people don't have parents, and these days, quite a lot of parents rent precariously too. They would be turned down as guarantors.
More parents renting is a factor which has changed in recent years.
I imagine most people don't have friends who would be willing to be long term rent guarantors, even if they could be.