Set of 6s in trouble...

[Black Aces 518]

Grunching:

Preflop is 100% standard.

I don't mind the call on the flop if you were assuming that Button would raise and then you would reraise.

Turn is standard.

I don't hate the river raise, esp since he did bet out the flop, so he has SOMETHING other than two hearts. If I had to guess, I'd say 89 [img]/images/graemlins/heart.gif[/img] The cap is pure spewery without a strong read.

(grunching)

pf call is fine.
flop: raise it! RAISE IT! It is relatively uncoordinated, but it's a family pot. Here's a good rule of thumb for hitting a set on the flop--> spew!
river: there are some hands that can beat you, so I probably just call the 3-bet. It looks like you basically let this guy get runner-runner flush for a cheap price. That, or he's slow-played a flopped set or something.