I'll agree with both Javier and Alan on this one. Any reputable folks are going to require security deposits. It's no coincidence that the plethora of craigslist scams and other scam ads out there typically offer their places for rent without a deposit requirement? Of course not.
A reputable landlord/property manager is only going to manage properties with deposits in hand- allowing for quick repairs and quick turnaround once a tenant has vacated and laid waste to the place in one way or another.
Smart individual homeowners looking to lease/manage their properties by themselves are EVEN BETTER served by ensuring they have deposits in hand- for the mere fact that the volume of tenant prospects they've screened is typically very small and their expertise in that area very limited.