Location is very good, apartment is good enough for 2 people to rest while in a trip to Rotterdam.
There is no wall seperating the kitchen from the bathroom, so it will be awkward if you go with someone you're not intimate with. Also the floor is a bit uneven in some areas.
The steps to get there are very steep so you might have problems carrying luggage up there.
Wi-fi sometimes didn't work but I found that turning the wifi on and off on your device, it would work.
Apart from these minor "issues", I had a pleasant stay there and if you need something simple, private and cozy, this apartment is a very good choice.