The apartment in general was nice and very okay for a week. But some things were quite annoying over time: the stairway was super steep, the apartment was not level, the WIFI didn’t work consistently (I had to call multiple times, the guy on the phone was very helping though). If you opened one window it startet to drip down water on the floor. One time the front door entrance code was changed without telling us.
After all there were no serious issues and we enjoyed our time in Rotterdam.