An accommodation is a place that can accommodate human beings, e.g. a hotel room, a camping pitch, or a meeting room. Many accommodations are for overnight stays, but this is not a mandatory requirement.For more specific types of accommodations not defined in schema.org, one can use additionalType with external vocabularies.
See also the [dedicated document on the use of schema.org for marking up hotels and other forms of accommodations](https://schema.org/docs/hotels.html).