FC-RS510 Crankset compatibility
Short answer is yes, you can swap in any 11 speed crank that uses the same bottom bracket standard, which on the Stevens is a 24mm axle Hollowtech II type. I believe all Shimano road cranks are compatible with that.

If you are considering a 48/34 or 46/32 crank you'll need to drop your front derailleur down. There can be issues with braze on brackets not going low enough, but the Stevens seems to have a clamp style so you should be OK. 

Links to the Shimano pages:

Shimano Specifications &amp; Technical Documents

Front Drivetrain Compatibility

Reading the compatibility chart is actually straightforward, components in boxes linked by lines are compatible. The chart looks complex because of all the component codes, but once you figure out how to read those it's easy. Component codes are two letter components type then the series. ST/SL= shift levers, FD= front derailleur, FC=front chainset, BB=bottom bracket, CN=chain, etc, etc. You can look up the series numbers on the Wikipedia Shimano page.