I shouldn't actually have named this bluff catch. Just "river situation"

But anyway, cross 150 hands, V is 45/34 and his 3bet stats is 27 and squeeze stat is 29. His cbet stats are flop: 31 turn: 100 and his river bet frequency is 29. So he is very loose. He went all in pre against 2 players with JJ53ss.
I decided to float flop with my gutter, a play which I usually do not make against regular players (I either fold or bluff raise) but felt fine against this particular loose and predictable player.
I hit the straight on the turn and it went x-x so I put him on AA, AKQ sort of hands. (Maybe I should have bet here?)
Then one of the worst cards rivered and I decided I didn't like to get bluffed here so I led out small. Is it better to x-f?

Did I play okay this hand? I could have folded pre but my hands were somewhat connected and against a player who 3bets 27% of the hands, I felt like it was okay to call.

Oh and is calling ever an option on the river? I do block the nut straight and if he had AA, he could be bluffing here.