These are all the Smetzer's on 1861 (with the name spelt correctly, that is)
Ann B Smetzer 1845 East Indies, Kamster Servant Chilton Somerset
Charles H Smetzer 1818 Hackney, Middlesex, England Head Westminster St John the Evangelist Middlesex
Charles J Smetzer 1856 Lambeth, Surrey, England Son Westminster St John the Evangelist Middlesex
Maria Smetzer 1842 East Indies, Kamster Servant Chilton Somerset
Mary Ann Smetzer 1825 Aylesford, Kent, England Wife Westminster St John the Evangelist Middlesex
Mary Ann P Smetzer 1859 Westminster, Middlesex, England Daughter Westminster St John the Evangelist Middlesex
Samuel J Smetzer 1861 Westminster, Middlesex, England Son Westminster St John the Evangelist Middlesex
Sarah E Smetzer 1849 Covent Gardan, Middlesex, England Daughter Westminster St John the Evangelist Middlesex
Susan Smetzer 1787 Strand, Middlesex, England Hackney St John Middlesex
Details for Susan (possibly your Susannah)
7 Robinson's Row Hackney
Sophia Martin Widow age 59 Retired Publican born Upton Hants
Ester Collyer Widow age 70 Independant born Middlesex London City
Susan Smetzer Widow age 74 Independant born Middlesex Strand.
RG9/155 Hackney Folio 13 Page 20
Household Schedule 103