The location is shown in a map on page 42 of this PDF.
The overlays that highlight 17th century London features are approximate and derived from Wenceslaus Hollar’s maps:
Open location in Google Maps: 52.325013, -0.203151
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There is a 1901 photo of the Nun's Bridge at:
Hinchingbrooke House in Huntingdon, Cambridgeshire, was built around an 11th-century Benedictine nunnery. After the Reformation it passed into the hands of the Cromwell family, and subsequently, became the home of the Earls of Sandwich, including John Goddard, 4th Earl of Sandwich, reputedly the "inventor" of the modern sandwich.
On 8 March 1538, Richard Williams (alias Cromwell) had the grant of the nunnery of Hinchinbrooke, in Huntingdonshire, for the undervalued price of £19. 9s. 2d. while he was an official Visitor overseeing the dissolution of the monasteries. His son, Henry Williams (alias Cromwell)—a grandfather of Oliver Cromwell—built the house adjoining to the nunnery, and upon the bow windows he put the arms of his family, with those of several others to whom he was allied. https://en.wikipedia.org/wiki/Hinchingbrooke_House
Chart showing the number of references in each month of the diary’s entries.