Had a lovely stay here. The apartment is clean, minimalist and a great size for 1 to 2 guests. It is a short (~ 10 min) walk to the river and centrally located. I would reiterate previous reviews that mention the noise at night as it gets lively on the street in front of the apartment (which faces the street). If you are a light sleeper I would consider alternative locations; if you can sleep with earplugs you should be more than set.
Paulo is a fantastic host! He is incredibly helpful with recommendations for things to do in Porto, including offering a few sights that I wouldn't have discovered on my own and were well worth it. Thank you!