I really hate that house, I'm afraid! All those dark and dismal corners and odd shaped rooms that are just one tile width too small!
I actually find it quicker to start from scratch than to redesign an existing house, especially if you're doing it in game and not in build mode before loading a family to it, as you can't just demolish walls etc. as you want without losing toilets, wall lights etc.
Well, I meant I liked the house as in one I might like to live in myself, but it's not Sim-friendly.
I might have to try my hand at building now that I have a few basics and a little experience under my belt. One of my favorite houses is the Family Farmhouse that comes in the bin. Lots of room for a growing family, and if you take the fireplace out of the kitchen and add more countertops, you have even more room.