My friend and I had the best stay at Marisa & Mário's apartment. The location was absolutely superb, everything was within walking distance, and there were ample coffee shops, restaurants, and small supermarkets close to the apartment. The kitchen was well-equipped and it was a very nice touch that they provided a small decanter of port! The aircon in the rooms was much appreciated, and the bathroom came stocked with more than enough soap, shampoo, etc. We both spent the week working remotely during our stay in Porto, and generally had no issues with the WiFi at all - it only became a little choppy in the far corner of the second bedroom. So if you both need to be on calls all the time, which you can't do from the living room at the same time, that's 1 thing to keep in mind. Other than that, we cannot recommend this place enough and will definitely be back!