I had one introductory call with HR, followed by a presentation to the same person and another member of the team.
Overall, it wasn't a negative experience, but I am quite certain that my presentation was unnecessary, as the decision had likely been made before I presented. The team member showed little interest in what I was saying, and the interview itself was quite brief. I left their office feeling that it had been a pointless exercise.
The fact that the interview took place in what seemed like a junk room did not influence my rating. A pretty... mediocre experience.