If you can remember his name search for his name on the site below and figure out his character code.
Here is all you need to know about console commands.
Open console and enter player.placeatme characterCode (enter his code you found instead).
This should get him to you,if he is dead enter prid characterCode(to select him) than write Resurrect after you can use the first code to bring him to you.
Note : You might need to use Disable command to remove some things from game completely or use moveto to get to them.
If something is still wrong read the wiki good there is bunch of commands to do almost anything,just figure out what will work best for you.