Hi,
If he's bad bet/folding the turn again for value is fine, he'll call again with any Ax and broadways with a gutshot with or without a heart, as well as any pocket pair with a heart that he peeled the flop with.
If he's some kind of tag then he'll fold a worse Ax to another bet and the rest of his range already beat you when the flush gets there, so it's usually a c/f.
As played since you don't know him looking him up is fine on the river, it's really cheap and you never know he might be "valuebetting" a worse Ax or throwing in a senseless bet with 77 for no good reason.
Hope it helps.