I too have heard of agencies hiring out property without the owners knowledge. This was in Spain.
However, your best bet is to use a company that is recommended to you. Additionally, you should be able to arrive at the drop of a hat and stay at your place. Make the agency aware that you have friends living nearby if they have a problem. Just so they know someone else is keeing a careful eye out.
I do hope you find someone you can trust.
Ivana
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