[Melusine]

Do a Google search on it....
The most obvious subject would be the Great Fire. Try and read up on that a bit and imagine the effect it had on people's lives.
Try and find some info on Pepys' Diaries, too, they're quite famous and should inspire you. His diaries were written in a secret code that was cracked years later. He started writing it in 1660.
Try to start with thinking about the kind of person you were: rich or poor, scholar or merchant... what religion did you have, what political views. Remeber that the period of Commonwealth had just been ended seven years ago by the ascension of Charles II. How does your persona feel about that?
An other interesting viewpoint may be to write your story from a foreigner's point of view. When war broke out between France and Spain in 1635, London saw a huge influx of protestant refugees. You could try to write from the stance of such a refugee who decided to build up a new life in London.

In short, try to find a persona and immerse yourself in his world. If you can REALLY imagine what his life and ideals were like, your story will be convincing. Good Luck!!!

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