When a treehouse and a cabin really love each other, they get together and make this lovely, dual-level residence. Hanging over a Mt. Washington hillside, the two-bedroom, two-bathroom house has the rustic, mountain charm and wooded surroundings of a much more rural house, but with a modern twist and hipper, more urban location. The house's many, many windows and occasional high ceilings make its 831 square feet feel airy, while a handful of decks (including a private one outside the master suite) and outdoor spaces offer plenty of opportunities to enjoy the picturesque view. Last sold in 2013 for $489,000, it's now asking $555,000.