For the source text click/tap here: Bava Metzia 64
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Rav Yosef b. Minyumi in the name of R’ Nachman teaches that if Reuven lends money to Shimon, Reuven is not allowed to live in a house owned by Shimon without paying rent, as this would constitute a form of collecting interest for his having advanced a loan.
In fact, this is true even if Reuven has access to other lodging and he is not in need of a rented room, and Shimon is not looking to rent out his dwelling.
Although Reuven is not receiving any financial gain and Shimon is not providing any financial benefit, this is still prohibited.
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