Had a great experience. Atmosphere was very friendly and it felt like having a casual conversation with colleagues.
I was asked some general questions about my background as well case study questions, which were a bit tricky, if you have no idea what's their purpose is. They are to test your team work. With that in mind, it is easy to answer them.
My second (final) interview was with two senior employees of the company. It went very smoothly and friendly. I got asked regular questions, like "why am I better than the rest?" and "did I make any mistakes in my previous job and how did I resolve them?"