Unable to answer "How many people can sleep here?" – Imkerverein Neustadt a.d.W. (Wilderness Hut) – https://osm.org/node/13084546073 via StreetComplete 63.0:

Vereinsheim, Schuppen

Attached photo(s):
https://streetcomplete.app/p/337899.jpg
https://streetcomplete.app/p/337900.jpg