A truly wonderful experience. An apartment that is spacious, always smells nice, and is close to the very center - I walked it several times within one week. Also, the neighborhood is calm and safe and I would recommend it to women who travel alone as well. (People, do not get spooked by the noises from the upper apartment - the building is fine, but as in most of central Lisbon floors are hear-through to a degree :))
Carlos is a very welcoming and relaxed host and I would repeat this experience again.