The apartment itself is great, in a top location close to the metro. It's in apartment in a building where most of the apartments are owned and operated as Airbnb's by the owner. The locks are automated locks which you open with your mobile phone, after registering via an app that the host provided you with.
On the downside: We were lacking a number of basic household items (-kitchen towels, extra garbage bags, - dishwasher tabs, - brush to wash the dishes). We've let the (professional) hosts know, so should be fixed next time I assume.