So I was watching videos of Saudi home life the other night (boy are their houses UG-LY, the high end compounds where multiple generations live.) Anyway, the homes had sinks scattered all over the houses, just like this house. There are separate sinks for men and women, for the rooms where they eat together as family and for their individual eating/entertaining areas. Sinks in bedrooms, sinks in hallways, there's a real focus on water and cleanliness over there.
Now I'm thinking this house at one time was owned by a Middle Eastern family, and the sinks we're seeing aren't in bathrooms. Those sinks might be areas to ritually clean before eating, after sex, before touching the Koran, before prayer, that sort of thing.