Overall I had a good time at the apartment. It looks exactly as the pictures and it's quite clean. The neighbourhood is calm. It's very close to the airport (1 metrostop and a 5 minute walk).
The apartment is on the ground floor. In all fairness, I didn't check this beforehand, so that's my bad, but safety-wise (especially when I travel alone) I'd prefer not to be on the ground floor. On the other hand it was a nice area and had no problems.
The only disadvantage to the apartment was the bed. It was a very uncomfortable, hard bed and unfortunately the sheets were stained. I also just let the owners know, so maybe they can make some changes here.
Either way, all in all a good, calm place to stay, with a metro stop nearby. You'll be in the center within half an hour!