The good: Mirjam is punctual and responds to messages very fast. The place is clean, sunny. Kitchen is fully equipped (which is awesome), the neighborhood is indeed quiet. It has decent wifi and well served with supermarkets on the area.
The bad: shower-room: very "uninviting" with no box or curtain - water is always all over the place. Size of the sink: You can't even place your toothbrush on it. The flat is on the 4th floor, so if you have a lot of luggage I hope you spend some time in the gym. No elevators here.
Also recommend renting a bike because the region (known as river-area) is not so central.