"En face de" is an expression meaning "across from."
In English you would say it something like:
"Take the boulevard across from the Carrefour" --or-- "Take the boulevard just in front of the Carrefour"
The expression might be easier to remember if you visualize the Carrefour building facing the boulevard.
Additional information: Carrefour is the name of a very popular grocery store chain in France. The English equivalent of the word "carrefour" by itself means "crossroads"