When you reach the entrance of Stromgarde, head to the right, around the outside. You'll come to a hole in the wall that you can hop through. Then, head left, cross the bridge and keep heading straight. He's in the house with 2 guards, both of which I was able to pull without aggroing him. The guards are linked to each other, so you'll pull both at once.

He's a lvl 44. His guards were, I believe, lvl 38 and 39.