He's packed an air mattress and a set of sheets to use during his nights at friends' places. For those of us living in small spaces with no guest areas, this is such a huge help. Of course, he's driving a car, which makes taking these items along a lot easier than if he were taking trains/planes/buses. But given that he's staying a night at a time at each stop, this prevents a lot of his friends from washing sheet sets that have barely been used.
What considerate details have your house guests thought of? What do you do to make your stays easier for your hosts?
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