Juliette is a very warmly host. She even waited hours for our arrival because we stuck in a traffic jam (better think twice about arriving in Porto during marathon by car). While we had some understanding issues at first (my french is not so good), but everything just worked perfect! The flat is beautiful and very artsy and stylish. Juliette definitely has a good taste. And the neighbourhood we lived in was very hip and stylish (and luckily not so touristic!).
So everyone who plans to go to Porto: Go for it. And go for Juliettes stay!