See the picture online of the cell for American prisoners at the Henry Nelles Home (Cell for American Prisoners) via the Grimsby Museum Digital Collections.
"Description: [Links added] ...located in the basement of the Nelles house (125 Main Street West)... ." "The house was owned by Colonel Robert Nelles (1761-1842)... ." "His eldest son, Henry (1789-1841), lived in the home following the War with his young wife Sarah."