Yeah that's roughly what happened here. Although I knew he was likely in there because he parked his motorbike outside.

He was actually in my 2 year old daughter's bedroom when I opened the door. I heard him leave it and come down the stairs.

Small argument ensued and he sent me an SMS right there on his phone saying that he was coming to do an inspection on date X which was that day. Then said "oh sorry must have been delayed" with a smirk on his face, got back on his motorbike and rode off.

"He was actually in my 2 year old daughter's bedroom"

I think I would have phoned the police at that point!

I did. See one of my other comments.

That's probably a great way to get shot, especially in the US. Not only is sneaking into a tenants place (at night of all times) an asshole move, likely illegal, and a clear abuse of power, but it's also such an incredibly stupid thing to do if you value your life.