We spent so far a year just on the design, it's based on activity patterns, charts how we live / move in our current place and which rooms are accessed more often from which other room.
Also rooms located to have the most natural light at the time they are being used the most - i.e. living room gets more sunlight during the day and afternoon, kitchen gets sunlight in the morning since evening cooking usually happens late and so ..
First floor consists - entrance hall,kitchen with breakfast and dining area, pantry, living room, library room, cigar room,toilet, staircase upwards and downwards
Second floor - bathroom with sauna and laundry room, cinema room, bedroom, gym and small working-desk area, acces to roof