The room layout, the chairs, the table, the phones, the coffee, hats and coats - must be marshalled. This is basic stuff. Interviews in a pub bar are too informal and prone to interruption. Lunch in a quiet restaurant may offer useful informal surroundings and a break in a day-long programme of events. Discussions with a candidate whilst conducting a Cooks Tour also fit into this pattern.
Checklist select a suitable room for a conversation with no interruptions.
Avoid rooms with glass doors and panels which become shop windows to people walking down corridors.