Have you met him at the café? At certain points during his route he moves there. I usually search everywhere to make sure if I can't find a boy at their usual spot
Thanks, I'll try that! When I played through Kovit's route he could only be found on the street or at the spa, so I thought it would be the same. Do I need to unlock the mansion at all?
No you don't, as far as I know the mansion will be available only during the party event and will never be available to explore (which is a bummer because I hoped we could get on with Senior Schwartz)