What do you think about a good friend moving in with a married couple to benefit themselves and the couple financially?

Hunter • RN
My best friend at work, which is basically all my life is (I'm an RN) pays a ridiculous amount of money for her lease, and when it is up, she has tossed around the idea of renting our extra bedroom for half the price. My husband and I have weighed the pros and cons, and can't decide if it is worth it or not. Any advice on how we should go about it if we do decide to move forward? 

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