Had a great stay with the five of us - however not in the apartment we booked. Bertine contacted us that the apartment we booked had issues with the water supply and offered to put us up in another one of her places in Rotterdam Centre. She was very helpful and everything was taken care of really well. While the apartment was well-worn, everything was clean and well taken care of. Furthermore: Bertine has been very helpful throughout our booking and stay. Would definitely recommend.