This guy is safely back at the local shelter where he came from.
(Full details in locked posts -- if you didn't see them, and would like to be on a filter that includes stuff like cat drama, feel free to comment.)
The name on the shelter paperwork is Eli, so that's what I'm going to call him, not the name picked out by the roommate who brought him home and then wasn't around to take care of him.
Eli is super shy and super timid, but also totally mellow -- even when he was scared he never bit or scratched, just hid. In the three weeks he was at the flat, there was literally one time when he felt safe enough to approach a human on his own volition. Then he got spooked again, and there weren't enough days to re-reassure him before returning him to the professionals.
But I did get photos of him on the couch.
Petting for a sweet boy.
I hope he gets adopted by someone he can climb all over.