The Westminster [Bridge] Stairs on the lower-right corner of this segment of the 1746 map. http://www.motco.com/Map/81002/SeriesSearchPlates…
The overlays that highlight 17th century London features are approximate and derived from Wenceslaus Hollar’s maps:
Open location in Google Maps: 51.500626, -0.123751
Chart showing the number of references in each month of the diary’s entries.