I have a basket of bits and pieces that I just leave where people can rummage and find what they might want (I made it up when siblings may have had to either stay over, or just call to us before going to Church, for family funerals that they'd travelled overseas to - and tried to think of all necessities that they might need at such a time and may have forgotten, most are travel sized. Toothbrushes, toothpaste, deodorant (male & female), shower gel (male, female, neutral), cotton pads, makeup remover, moisturizer, q tips, clear nail varnish, nail varnish remover, comb, hair spray, spare plain tights, soap, Rescue Remedy, pen, paper (notepaper and a couple of index cards), pocket packs tissues, safety pins, sewing kit, painkillers, glasses cleaning spray, am probably forgetting stuff but that's the gist of it....lots are from hotels too over the years and I've raided it myself when I go travelling). I actually usually leave it in the wardrobe but people can go through it if they need anything.
When visitors are staying - things like jug of water and glasses are left out (well, glasses out and jug goes up just before them or shortly after arrival). And something nice to nibble.
A couple of recent magazines if I have any, or maybe a couple of books. They can raid the "library" (2 very full bookcases) in the sitting room but often won't, whereas I do find books in the room are dipped into.
Radio and a clock, lamp. Box of tissues.
Fresh towels for each person.
There are maps in that room too, with tourist information - but that's because we had au pairs for a few years and it was their room, so those things were there for them.