Unfortunately this one of my first hands at the table. I agree having even a slight idea of villain being loose/tight helps making the decision.

I folded turn already, because;
- Villains betsizing is weighted towards value
- Better A's/2 pair/sets are possible
- I definately have to fold to any spade river aggression, maybe to any river aggression
- If villain is really bluffing I think he has to bluff the river a large % of time. That might be too much credit for an unknown 50NL villain though, and it's an argument for calling 2 streets with our hand.
- All my 'outs' are tainted

On the other hand, worse Ax is a possibility and so are random bluffs.