Very casual and friendly - they're looking for a good culture fit. Just asked the usual questions, ie. Why you'd like the role, what experience makes you a good fit for the position. One negative - even if your interviewer says you're good to go / have the job, it can take a while for things to be officialised through HR.

I was greeted very well at reception and made to feel very welcome. I found the interview process friendly and engaging. I was made to feel comfortable. They were very approachable.