@Rubén16 I host a private room in my home, so there's no library in the guest quarters, but I let guests know they can borrow any books off my living room booksheves. I have a ton of movies as well on DVD that they are welcome to watch, but haven't had anyone take me up on that- it's never cold here and I don't get many guests in the summer rainy season here, so most want to be out and about, not sittiing inside watching a movie.
But almost every guest is a reader and want a book to take to the beach with them. They normally come equipped with one or two of their own, and many leave them behind when they go, so the library is growing. I have a shelf of books that guests can read while here, but need to leave in my collection, and a shelf with ones that they are welcome to take with them if not finished.