"they had taken an apartment on the Guidecca"

Sunbeams on Giudecca
Creative Commons AttributionSunbeams on Giudecca - Credit: robophotos

Though Giudecca, an island in the Lagoon of Venice,  could be translated as 'Jewry', it was not one of the three Jewish ghettos in Venice. (See bookmark 207).

It is no.15 on the map at the back of the book (Afterword p.7).