We (Couple and 5year old boy) spent a great week in Christinas Flat.
It is beautyfull furnished and looks even nicer than on the pictures! We met Christina personally - she was super friendly and also during the stay we had contact and she answered us very quickly.
Also the area is very central; we rented some bikes (bakfiets) and got in 20min to the Beach (Scheveningen)!
We can highly recommend Christinas Flat for a stay in Den Haag!