Marco's apartment is located in the old city center of Porto, which is a safe neighborhood but most importantly: really beautiful. We had a great 3-night stay at Marco's place. We stayed in the studio on the top floor. Very quiet since the apartment is on a small almost hidden street. All of Porto's beautiful highlights are walking distance from the apartment. Marco was very responsive through Airbnb messaging when we arranged our check in (we arrived late, which was not an issue :) and our check out.