Hello Robin,
it's Franschewater. After the "gracht" was filled up, it was called the St. Laurensstraat. I'm afraid the street was destroyed during the bombardments in May 1940.
http://www.joodsamsterdam.nl/rotterdam/strzandstraatbuurtfra... The old pic on the right is the Laurensstraat (1897).
Regards, Freddy