I voted for the window -- not for any reason I can easily explain. It hits me on a non-verbal level and makes me smile. The three houses hit me at my head and are perfectly sensible and utterly pleasant, but the window hits me at my heart (no pun intended). Maybe it's the sheer unexpectedness of that big red heart in the window.
BTW, what will the logo be used for? If its primary use is going to be as the little graphic bug that shows up in the browser bar before the http address, then seeing them both at itsy-bitsy size might be better.
I've got my country's 500th anniversary to plan, my wedding to arrange, my wife to murder, and Guilder to frame for it; I'm swamped. -- Prince Humperdinck