New Poster AQo in BB

[jmumm]

New poster here looking to get some advice on this hand.

Villian seems to be a pretty decent player 15/9/2.4

Full Tilt 0.50/1 Hold'em (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is BB with Q[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">5 folds</font>, <font color="#CC3333">Villian raises</font>, <font color="#666666">2 folds</font>, Hero calls.

Flop: (4.50 SB) 3[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">Villian raises</font>, Hero calls.

Turn: (4.25 BB) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Villian bets</font>, Hero calls.

River: (6.25 BB) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Villian bets</font>, Hero calls.

Final Pot: 8.25 BB

Is it okay to check-call down in this situation. I didn't put him on a flush because I don't think he would be value raising heads up on the flop. I don't give him credit for AK because he's in late position and could just be trying to steal. I'm thinking he has a weaker ace than me. Is check-calling the right play here?

Also, should I consider 3-betting here preflop if I think he is trying to steal? Or does being out of position suggest I should probably just call.