Pepys was Naval Administrator, Chief Secretary to the Admiralty and a Member of Parliament.
He associated with the highest levels of London society, yet his diaries are down-to-earth in their writing style.
Pepys' Diaries are available in paperback from Penguin books (paperback) and well worth a read. His account of the Great Fire of London in 1666 is the only day-by-day account of that event that we have.
He watched Old St. Paul's Cathedral burn. The cathedral on that site that we see today was designed and built after the fire by, famously, Sir Christopher Wren from 1675 to 1710.
Pepys' diary told about everyday life in London in his time, and life in his home.
Many editions which have been published omitted passages about Pepys's sexual adventures which editors thought too obscene to be printed. Some editions leave these passages in the book just as they were written; these can be purchased from Oxford University Press.
The small church where Pepys and his wife are buried--St. Olave's near the Tower of London--is the most interesting I have found in London. It is a medieval church that escaped being damaged in The Great Fire of 1666. It was the church Pepys and his wife attended. Near this church is a blue plaque that marks the place where his home stood. Even the entrance gate to the church is interesting........