I'm not from Bellevue myself, but I'm also looking at moving to the area. I do have family living there, and have spent a bit, though not considerable time out and about in the neighborhood.
I think it's a great place. It has a kind of small-town vibe to it, with a pretty decent main-street shopping area. It's pretty. The people are nice. The Kuhn's grocery store is always annoyingly busy.
I DO wonder about road maintenance in the winter, but that's something to have in mind Anywhere around Pittsburgh.
Also, Bellevue is a dry community, so there are no bars (to visit and/or worry about being problematic) or wine&spirits stores, so you have to trek to Avalon, or into the city or wherevever, to buy or drink.