Unfortunately, we didn't have the best experience at Koen's. While the location is really great, there was a lingering smell on the ground floor which was really unpleasant to come home to/sleep in. As well as this, there was an an issue with noise and a lack of privacy.
The host lives in the same building (the Airbnb is a subdivision of the property) and uses the courtyard that the living/kitchen faces onto each night. We would come home to find the courtyard filled with strangers being able to see us while they had dinner and drinks because the window on the stair has no frosting, and the upper bedroom had a velux window which looked right onto the courtyard. There was no air conditioning despite being told we could set the thermostat to low. This made the apartment very hot, and there was only a fly screen on one window (there are a lot of mosquitos at this time of year). We also found the stairs very dangerous. For the price, we just expected a better/more private experience.