After studying and analizing your needs and requirements, I came up with two alternatives. Alternative 1 is that the living room, dining room, and kitchen are placed in one open place concept. But the kitchen can be closed with the folded doors. There is no study room in this alternative, only desk and chair to study near the living room. However, in alternative 2, there is a small study room near the kitchen. In this alternative, kitchen is smaller than the alternative 1, and has no natural light. The single bedroom in the first floor can be divided in two different small single bedrooms in the future. I hope you like my design, as much as I do.