All the typical PM questions: 1. Business model of Trivago 2. How do we make money? 3. Who are our largest partners? As far as the difficulty was concerned, they were easy to answer if you have a decent PM experience. However, the Hiring Manager was giving away her inexpertise in the field buy repeting the same question in different words. As far as the case study is concerned, it took 3-4 days to prepare and then creating a presentation for the same. However, all these efforts were in vain as non of the interviewees took the time to read through my case study and was simply asking random questions regarding my approach. If they'd put some efforts to read it through, the whole conversation could have been much better. But it also showed their lack of understanding simple PM concepts like prioritization, stakeholder management etc. It didn't work out in the end (obviously) but it was quite an experience. My only suggestion to fellow applicant would be not to invest more than 3-4 hours to solve the case study as they hardly care about it! It's just how things works at Trivago.