Hey Elisa,
What I found regarding any not just guests travelling for work, since we are living in warm climate, few bottles of water in the fridge, a bag of ice in the freezer, smile and being available works all the time.
Specifically about the travelling guests they like the availability of printer with some printing paper, charging stations and additional monitors, a comfy chair work a long way. Fast and reliable internet connection is understandable.
We make the ambience since the beginning: some music in the background that can help focus, working lights on, well air-conditioned.
I hope I helped you,
Happy hosting,
Branko