Filming for the second season took place from January 14 to May 4, 2019.
Aired in Germany on Arte in 2018 on March 1 (first four episodes) and 2 (last two) and again on ZDF on March 3, 4 & 5 (two episodes per day). While the two channels often co-produce programs, they typically don't air on both in such quick succession.
Filming for the first season took place from November 8, 2016 to February 20, 2017.
Gabriel's hotel room scenes have been filmed at the "Roomers" hotel in Frankfurt, Germany
Season 2 was ordered on March 4, 2018.