To stay at Sidney's apartment is really a great choice if you visit Den Haag. Even though, it is located next to a bigger road, we didn't have problems with noice (maybe a little with the gulls, but only a little). To get to the city or to the beach is easy, do to the tram station right across the road. A supermarket can be reached within 5 minutes by foot.
The apartment's furnishing is of higher standard, the beds are great. Also we didn't have any problems with communication up front or during our stay.