The apartment is located in Scheveningen, really close to the beach (5 min by bike). You can reach the City Centre by tram (it is just outside the door, but quiet. You wont hear it in the evening.) or by bike (rent some or bringthem with you, it's worth it). The bike ways are amazing in Den Haag.
The apartment is super clean and you will find everything needed inside. My host was so nice and always there for me, if I needed help. I can really recommend you to stay here, if you want to come to Den Haag (Scheveningen). :)