Resolutely refuse the first unit 20 1 and 30 1, and pay attention to keep warm. It is about 5 degrees lower than other houses. It's very cold in the west, so it's difficult to type in winter. If you use a radiator, there is a quarter more traffic than other people's homes.
Why is the 20 1 in Unit 2 not so good? It's almost after nine o'clock in winter, and the room can be full of sunshine. If there is no shelter in front of the building, there can be no building in front. If you can't guarantee it, then give up.
You said there is a playground in the west, which means there may be a balcony in the west of 1 unit, 20 1, 30 1. Where there is a balcony, there must be a door, which is Fan's taboo. Gables are ghost doors. Never, unless you work hard. Otherwise, there won't be much. This is a matter of feng shui. Without a balcony, it's not good to just open the window on the gable.
Why do you say 402 is good, with good lighting, good ventilation and high vision?