Summer is the most dangerous season when people can be robbed. So I try to count some security measures, which can help us. In my opinion the best thing what you should do to give key from your flat to your member or neighbor. He or she can check your place of living. Unfortunately sometimes we have no the similar oportunity, so people will have to find another solving of this problem. You should not say to unknown people that you will be out of your flat. Because some of them can be a burglar and you even find out about it.  The next thing which can help you to protect your house is signaling. It is very comfortable technology, which can call the police and report about robbery. If you flat was robbed and you found out about this situation due to your neighbor, probably you can ask him to control the situation before you come back. In conclusion I can say that you should have the person who is trusted by you and he can help you.