Pretty standard interview format for an internship. Two people (Future supervisor and another collaborator working in the same office) asked questions for approx. 20-30 mins. They did not test my language skills, the entire thing was done in English.

There were two rounds of interviews. The first was more comprehensive and solely with my potential supervisor. The second was shorter, more personal, and also featured the supervisor's boss. Both employees were friendly and eager for me to share my previous work experience.