It looks like Siena, IT. Not 100% though.
The latest Mercedes commercial was filmed in Montepulciano, Italy. I saw them making the commercial.
Mercedes-Benz GLK-Class was created in 2008.
The 2011 Mercedes-Benz GLK-Class has 24 valves.
The 2010 Mercedes-Benz GLK-Class has 24 valves.
The 2011 Mercedes-Benz GLK-Class has a V6 engine.
The 2012 Mercedes-Benz GLK-Class has a V6 engine.
The 2013 Mercedes-Benz GLK-Class has a V6 engine.
The 2014 Mercedes-Benz GLK-Class has 24 valves.
The 2012 Mercedes-Benz GLK-Class has 24 valves.
The 2013 Mercedes-Benz GLK-Class has 24 valves.
The 2014 Mercedes-Benz GLK-Class has a V6 engine.