We had cooperation from them and hashed out solutions (delinquent taxes or liens or something like that.)

I want to find solutions that are mutually beneficial don't want to create problems. 

The only solution I can think of is asking around the neighborhoods or to mail the empty address.

You also should give them instructions on how to leave the house to ensure they receive the maximum deposit back and avoid additional charges for damage....Mow GrassWeed Flower BedCleanout worksheet.....how to clean, what you expect, etc.

By controlling the account, you will be the manager of the furnished apartment for the owners - communicating with the guests, cleaning and repairs - without bothering the owners.

The outcome is going to be a clean rental property bringing in $1500/month Lessons learned?

Treat people like responsible adults who are able to problem solve, come up with solutions and keep on top of their obligations.

contractors never clean up. 

Sometimes My vacancies are as short as a day or two.I typically advertise the property as being available 3-7 days after vacancy so I have time to inspect, clean and repair, and prep it for the next tenant. 

Unless you first find out what they need (it's not always a lump sum of cash) and then present solutions to their problem you're mostly throwing paper airplanes into the wind.