I didn't have any communication with Niels but with Luis and it was a pleasure to talk with him. The apartment was easy to find and the instructions to access the key for after hours check in was very clear. The place is nice and well situated (5-10 min from the tram station). The bathroom was very tight and need a good group organisation, but it wasn't a surprise, since it was described up front. Moreover the apartment is clean and cozy.