Ok, question understood, internalized the plot (without the granny flat) again. I don't see any special features compared to other plots. You don't have any special status or any special dimensions. I would probably place the double garage to the east. House in the middle. You have a slope. Have you already considered how the house concept (size) will turn out? Basement open to the east, possibly already a sleeping floor there (or office, hobby) in addition to utility rooms, ground floor as living area with terrace facing the west garden, upper floor sleeping area... complete privacy won't be achievable, to the west your neighbors could look into the garden from the upper floor. You could do the same. But no one will stand there to watch you.