The flat was comfortable, as described and a nice place for us to rest after a busy few days.
Nathalie was quick to respond to questions and helpful and flexible with check-in and check-out; she even suggested things happening locally that weekend that might interest our 6 year old son.
It was really convenient that the supermarket was so close and the flat had all of the utensils and amenities we needed for eating /drinking for a couple of days.
Beyond the hosts' control, there was a city festival happening in Rotterdam the weekend that we were there, and therefore the outside noise was a bit too loud for us.
Having a child with us, we used the tram to get in and out of central Rotterdam (as tourists, the minimum ticket we could buy was for 2hrs use, which felt quite expensive for what was a relatively short tram ride), but the route was easy to navigate, had regular trams and was quite quick.
The area where the flat is located has quite a different feel to it than the harbour area (where we'd stayed beforehand) so, having a child with us, we spent evenings inside the flat - but our son was happy watching the few English TV channels we had access to, or using the reliable wifi to watch Netflix on his iPad!
On balance, the flat was comfortable and we were happy there for our short trip, but, as a family with a young child, the area wasn't the best choice on our part.