Where did the sultan's mother live? - Department of Valide Sultan. - The Harem 5

Where and in what environment was the mother of the Sultan staying in Topkapı Palace?
Hürrem Sultan Was Valide Sultan?
What conditions were sought to be a Valide Sultan?
Who was the last valide sultan living in Topkapı Palace?
Which apartments did Valide Sultan's Department separate from each other?
How many rooms and how many halls were there in the Valide Sultan Flat?
What was written on the walls of this private department?