Villain is unknown, but after 25 hands he's maybe 12/8/7 or something.

Party Poker No-Limit Hold'em, $ BB (9 handed) from (Format: Bet The Pot)

stacks
Hero ($26.80)
MP2 ($30.20)

Preflop: Hero is MP1 with , . SB posts a blind of $0.10.
2 folds, Hero raises to $1, MP2 calls $1, 5 folds.

Flop: ($2.35) , , (2 players)
Hero bets $2, MP2 raises to $5, hero?

Raise preflop to 1.50 too. Yeah, this guy is stacking off with his lower set.

I have to agree with DoctorHandles. I think he has 22 or 99 25% of the time and KQ, AQ, QJ, J10 JJ, 1010 the rest of the time. PT stats after 25 hands don't mean anything. You're better off ignoring them until they hit 50 hands, IMO.

I'd call the raise and either check raise the turn or lead into him for something small to entice him to raise. If the turn is a 10, J or K I might get worried about a possible straight draw and wouldn't want to risk giving him a free card.