Does anyone know the history of the heritage cottages in Nicol Street?

Can any members of the community help with a bit of history. I am writing copy for a website for the heritage cottages in Nicol Street. Can the style of the building give a clue, and who was Nicol in Cape town? And any other history? Photos, people? Were they working men’s cottages?

Thank you

Colleen | colleen@kscope.co.za