have the run of (some place)
To be able move freely around an entire area. After being cramped in an apartment for years, our dog loves having the run of the big back yard at our new house.
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.