Just wanted to put in here that we have only Apple devices, and they can cast
Disney+, etc., to smart TVs without a Chromecast device or Roku stick. Hopefully that’s what the GF will have - TVs that can accept online content like D+, Hulu, etc. via multiple sharing technologies. The basic requirement should be that the guest have one of the several various devices that can receive the online content (D+) and cast or share it to the TV in the guest’s room, not that they have a specific brand e.g. Chromecast.