1/2 Live - A good River?

[rael]

Villian has been at the table for about an hour. He's not the worst player I've ever seen but he seems to be a bit of a calling station. I have not seen him raise PF, and I've only really seen him bet on later streets with good hands. He has about $350 and I have him covered.

I open limped in MP1 with 77. Maybe 1 or 2 other callers. Villain raised to 15 from BB. I call and everyone else folds.

The flop is 89T rainbow. Villian checks, and I check. Here is my reasoning for checking behind: I had him on AA-TT, AK, or AQs. With AA-TT, he would checkraise. With overcards he would almost definitely call. I gave myself a close to 0% chance of taking down the pot at that point. So my plan was to wait for a safe turn card and then bet if checked to and decide whether to call a bet depending on size.

Turn is a Q which I do not see as a safe card, as I am now only ahead of AK. He checks again, and I check again pretty much having given up on the pot and just hoping to get a free showdown.

The river is a 7. Villian bets $35. What do I do? Easy call, right?