give (someone or something) the run of (some place)
To allow a person or animal to move freely around an entire area. Now that the fence is up, we can finally give our dog the run of the back yard. Jeff and Haley give their kids the run of the house and it shows—there are toys in every room.
give somebody/get/have the ˈrun of something
(informal) allow somebody/be allowed to use freely a house, etc. that belongs to another person: He was very kind and let us have the run of his house while he was at work.