How many people are going to be living with you and do they all need their own rooms? Apartments usually come with three to four rooms, and not all of them are meant to be used as bedrooms, however, you can convert the rooms into office space and guest bedrooms depending on your need. You may want to have an extra room for a study or library, but realistically, how much use would you get out of it? If you aren't going to spend at least an hour or two daily in that particular room, then it is living space wasted, and its space that you paid extra for. Cut down on costs by thinking of the living space you need, then factor in the extra space later if the price is right.