This was brought up by someone else 4 years ago but there was no response to that post:
(+) Using the API to set a room for an Asset - Forum - Web Help Desk (WHD) - THWACK
As that post says, there doesn't seem to be a way to set the Room for an asset when Creating or Modifying an asset.
The API Documentation also doesn't mention this field as settable at all.
Location is fine to set, but for us, the Room is also very important in our environment.
Everything else is settable, even things like Notes and Custom fields, but not rooms!
Can this please be implemented?