The house of my parents is constructed like this. At the time of construction, a plateau was built up to bring the entire ground floor level with the street. Fully basemented below but everything is on a slope. On the side, there are only windows in the laundry room and a garden entrance. Above, there is a terrace and a small garden, below the play lawn, vegetable beds, garden shed. It doesn't work. From above, you cannot keep an eye on the children and it feels like everything in the house is too far away from what you would like to have downstairs in the garden. My parents only use the lower garden for vegetables now because they have difficulty going up and down the hill.