Antonio is a very nice person, he gave us good advice on what to do in Lisboa and in nearby cities (Sintra, Cascais). He answers quickly and his flat is well located.
The flat itself is in an old building, so the kitchen, bathroom and walls look also old. It is not really soundproof but it will not disturb you (unless you are a light sleeper).
The location is ideal, we can easily reach the center by feet and restaurants/supermarkets are right at the corner.