Elements of both the building letter and flat number are lucky for you.

How much luck depends somewhat on what you want of the flat. If you're expecting to host social gatherings at your flat, 401 is a lucky number for that. The number 401 is not only a number of whim, it's also a number of methodical preparation.

The digit 4 in 401 matches the heart's desire number derived from your name. The digit 1 matches the life path number derived from your birthdate. Because numbers that resonate with major numbers in the numerology chart are considered to be lucky numbers, it makes 401 a lucky number for you.

The letter "A" of the building identification resonates with the number 1, your life path number.

When the number of the letter "A" is added together with the digits of the flat number, the result is the destiny number derived from your name:

A
1+4+0+1 = 6

Because the resulting 6 matches your destiny number, it's another indication that the flat is lucky for you.

Further, if one thing you want of the flat is a place to house a family, the number 6 is also a good number for that.