What should I do if the property leaks from the roof?

The property must bear the responsibility.

Ask the property for money after it is repaired. Because I'm not sure when the property will be repaired for you.

Find him to fix it first, or find someone to fix it yourself if you don't come. Keep a receipt for all the expenses of repairing the house.

You'd better record your communication. Recording pens are easy to buy now. Although the law does not recognize stolen evidence, they can be used as a reference for judges.