Go ahead and book a trip to Monica & João's place now. You won't regret it. They are by far some of the best hosts I've met on Airbnb and their place is an excellent deal for the amenities, view, and location. You may also get personal touches, like local tips and/or a bottle of wine and snacks.
One hiccup for those who don't travel light: the apartment is up a pretty steep and narrow set of stairs, and the entrance isn't accessible by car (which adds to the charm of the place).