I would have to say a large eat-in kitchen with an island (where I live with my laptop). Our last house had a teeny kitchen--what a difference a house makes. And the laundry room right off the kitchen. The laundry room is not big enough, but the location is great.
I also like the split staircase going upstairs. Stairs go from the foyer and another set from the kitchen, meeting after 6 steps in a landing and then continue upstairs. A lot the houses in this neighborhood have 2 staircases, which would have been cool, but this is the next best thing, and we didn't waste as much space on that whole second staircase.
The finished basement is good, too. Big playroom for the kids with electronic basketball, Little Tykes basketball (my 6yo still loves that) ping pong (can have either ping pong or elec b.ball folded down at a time, not both, it's not THAT big LOL) and a rec room with a kitchenette, foosball, tv. Great hangout for the teens.