The overlays that highlight 17th century London features are approximate and derived from:
Open location in Google Maps: 51.545786, -0.055418
Hackney is at 10:30 on the Cary map.
Adam Dant has created a map of Hackney which shows where interesting historical sites are located. The map goes on sale in June 2018. However, a free version is available here, along with a list of many buildings Pepys' followers will recognize:
Chart showing the number of references in each month of the diary’s entries.