With RA, you are fairly safe in terms of "ability" to pay the rent, given that the RA part of the rent is as good a guaranteed income as the tenant is likely to have.
"Willingness" to pay the rent is another story. I have been through two RAs and on both occasions, RA was paid to the tenant, not to me, and in both cases, the RA was NOT passed on to me. Needless to say, both tenancies were short lived.
I spoke to the HSE CWO, and their position is that in any new RA contracts, the payment will go to the tenant in full. The only payments direct to landlord are for agreements already in place.
My general advice would be to ring the local HSE CWO to get a reference regarding payment behaviour for the proposed tenant.
For any tenant, ring the local Gardai for a character reference.
The above seem logical, but I did neither in the last two tenancies and have paid the price.