I really liked the place, and Carlos was an excellent host replying fast and solving a few problems I had.
The location is super cool. It is in a side alley, close enough to the center to get there on foot but outside the main tourist area. And close to public transport. Quite a few restaurants around (watch out, it is not a tourist area, so be prepared to speak Portuguese, which for me was a big plus). There is also supermarket 5 minutes on foot if you prefer to cook for yourself.
It was bigger than you would expect from the AirBnB offer (just like in the photos). It was spotless, and interior fittings were practically new. The Internet was fast and stable (I was working remotely). The main bed is very comfortable, the couch not so much, but you can only expect a little from a sofa. The terrace is excellent.
I really liked it and will try to book it again when I return to Porto.