Depending on where you previously lived, housing in the Netherlands might be different from what you are used to. Because the Netherlands is one of the most densely populated countries in the world, housing is on the small side. There is also a high demand for living space so it can take a long time to find a property. Start your search early. Demand goes up in August/September and January/February when students and academic researchers arrive. Keep this in mind when looking for housing.
There are different options for housing in The Hague region, from short-stay accommodation, to renting or buying. There are a lot of different resources and companies that can help in the process of finding somewhere to live. Some short-term options will allow you to register so you are able to get your Citizen Service Number (burgerservice nummer, or BSN).