Average but fine. They asked various questions about my experience then we reviewed some tasks. Mostly what they write is automated, with a small amount of editing required. Hotel Descriptions etc. This was 5 years ago.
The process consisted of two parts, being a chat with the recruiter and a test you will discuss with the teamleader. Neither of the two is particularly difficult for someone with experience in the field. That being said, you will quickly find out the company's sole priority is data not users. If you think you are applying for a travel-related company, you are sadly mistaken.
Interview questions [1]
Question 1
1st round: Just about your resume and why you choose for the company.
2d round: Review of your test and some 'what if'-questions.
I applied online. The process took 1+ week. I interviewed at Booking.com (Amsterdam) in Sep 2015
Interview
take home test, phone interview to discuss the test, invited for a face to face day with two interviews, one revolving around a second test that you do on the day, and a second just discussing general work stuff. interviews are done by two people who can be two copywriters or copywriter and PO or copywriter and designer.