Joao is really welcoming (also with a bottle of wine), gave us very good explanations about the apartment with practical exercices (door opening and closing ;)). He's flat is lovely, design and very clean.
The neighborhood is very nice and central, with many bars and restaurants (try the 100manieras for an unique experience!), but noisy at night, even with the double windows, so if you're sensitive...
This place is highly recommended, but I'm not sure I'll go back because of the street noises...