How does this guy play postflop? We know he's pretty loose preflo - will he play stuff like QTo OOP? will he limp-call it?

Hard to really know what the flop c/r means... opp is on a straight minraise and you have position to see opp's action on the turn; call is OK.

Your turn bet is really, really weak. I check behind on that turn and call a reasonable river bet, even more so if it's a non-heart. The guy may have flopped a set.