This is a fantastic, stylish apartment in a perfect location on the edge of the Bairro Alto. We had a great time there. It's well equipped, and the balcony (though small) made for some great afternoons and evening sipping vinho verde and watching the crowds make their way from bar to bar in the Bairro Alto.
This is a fifth-floor walkup, so it's probably not appropriate for people with mobility issues. But the bonus is that being on the top floor keeps the street noise to a manageable level. And Nuno is a great host - super nice, very responsive, and full of helpful local knowledge.
Highly recommended.