So I'm finding out there's a lot to looking for a new rim! Bike has a 10 speed freehub and disc brakes so options are limited or am I looking for the wrong stuff?
If you want to replace just the rim and can identify the existing rim and it's a 32/36 hole, you might find a direct replacement. Otherwise, you have to work out the effective rim diameter (ERD) which defines how long your spokes need to be and then find a hub with the same ERD.
If you're replacing the wheel, consider a dynamo wheelset for €140 delivered. Spend another €60 on lights and you've got a serious upgrade to your commuter...