Make sure garbage cans are set out on a regular basis for pickup, as if you were at home. Give him a list of service people you use, and make sure neighbors are notified when workers will be at your home. Notify the police, and your security firm if you have one, that you are leaving and how long you expect to be gone. Many police departments will add you to a drive-by list if they are made aware you will be away. Ask a neighbor if you may hide it under his doormat or in his yard.
Some models have a vacation setting.
Turn off the water supply to the washing machine. The hose to the washing machine could burst or leak while you're away. Unplug unused appliances, including toasters, microwave ovens and televisions. A fire could start from a cord and plug appliance, even when they're not in use. Secure or unplug the garage door opener, but only if it's not going to be used by the person watching your home.