in the 110 options that we considered, that was on our list too. As to whether I'd do parents retreat or kids rooms, dunno but definitely put a bathroom up there. No-one, whether it's kids or parents, want to be traipsing downstairs and it will affect the resale value. I would probably do parents retreat up there simply because that's more common in two-storey places but really a parents retreat is just a room and an ensuite so you could still use it as a kids playroom and maybe shift up there when they are older. I would feel funny about having two little kids sleeping downstairs nearest to the front door while I'm sleeping upstairs.

So amidst that waffle. Do bedroom and ensuite upstairs to retain resale value but use it as a kids playroom/bedroom.