I don't like it-
The FB circumstances I don't really understand (I don't do social media) but you already feel a bit 'wrong' about.
He keeps changing terms that's number one screaming red flag which would alone get an instant rejection from me. I wouldn't need any other reason.
I don't like him arranging for you both being seen on his own intimate turf with his buds.
I don't like the alcohol environment and work mix. I don't accept drinkers as clients.
Domestic homes I can figure out doors locks and escape plan, in a commercial building with specialised locks security systems I'm at a disadvantage
He's a bit too close for comfort...bumping into him afterwards is a possibility. I don't like that. I've done jobs on the other side of my road, but I am highly disguised. I don't expect to be recognised afterwards.