Great place to stay! Very close to the main station and in a quiet part of Rotterdam as well!
The stairs are VERY steep and the unit is on the 4th floor, (5th if you’re counting in the USA/Canada way) so don’t bring a large or heavy suitcase!
CJ was very friendly and accommodating.
The walls of the building are a bit thin, so you can hear quite a bit around you (however at night it’s all quiet and you can sleep peacefully). Besides that, everything else was great!