Take inventory.
     Calculate the are of the floor, deduct it from the sum are of the two bedroom, one comfort room, one living room, one dinning room, one kitchen and one laundry area. Make sure to left some space for the hall ways.

Tip: You can put the laundry area outside.
       Make sure that your living room is located at the left side of the door, the dinning room is at the right side of the door, the two bedrooms are at the edge of the living room, the bathroom on the side of the living room, the kitchen at the side pf the bathroom and the laundry area you can put it beside the kitchen (Make a door and then outside is the laundry area)