If I buy for all cash interest rates don't matter. Even if I want to sell, I can give the buyer a sweet deal by taking back a mortgage. So interest rates don't worry me. The signs are that all governments are so deeply in debt they can't allow interest rates to rise without killing themselves. That is supposed to prevent them from allowing rates to rise, but I don't have much faith in governments doing anything that makes sense.
To get back to the original question. How hard is it to get good tenants compared to say 20 years ago? And how do you qualify them? Assume a nice house in a good neighborhood, in top condition, with rent a little below the norm.