Kshmo,
Hopefully, you know more about him than just what he does or where he lives. That’s part of what research is for. Ask those who are recommending the shidduch how well they know this person and whether he is kind. Ask them to elaborate how did they observe or know this about him. Beyond that it becomes a matter of getting to know the person you’re with. Listen to the stories they tell, the language they use, the jokes they make. Do they ridicule others in their jokes? How do they treat your parents? When you come into the room, are they courteous to your parents in the way that they transition the conversation?
You’ll have opportunities to get to know the person.
Do you find that you have the ability to discriminate the kind from the unkind when choosing friends?