Welcome aboard!
Personally, I'm a fan of the previous-generation Quest. While the Sienna and the Odyssey stole most of the limelight, the Quest was quietly a solid choice in that segment. The ubiquitous VQ35DE engine is great, and most folks report tons of trouble-free miles.
However, the one you're looking at is right around the "scary mileage" mark. No, that doesn't mean it's too high. What I mean by that is this: Lazy (or too-busy) minivan owners who don't maintain their vehicle properly, start seeing minor issues crop up around 100-120k miles. THey panic, thinking it's on it's last legs, and bail for a newer model. Unfortunately, they've left ALL the preventative maintenance and upkeep for you, the unsuspecting new owner.
If it has a FULL service history, and you can get it for KBB private party $, then it's a good purchase.
Otherwise, you might be buying some scatterbrained soccer mom's castoff old van.
