Carlo's apartment is wonderful! It is in the middle of the winery district and some 30 minutes from the center. It is very close to the train station so ideal if you want to have a day trip away from Porto.
The apartment is spacious, with a large living room to share, a kitchen and 2 bathrooms. You share these spaces with the other guests (there are 4 rooms in total so there can be quite a lot of guests). The apartment was clean when we arrived even if the presence of other guests definitely impacted the cleanliness. Overall it was fine even at the end.
Carlos himself was an outstanding host, he met us at the apartment when we arrived and presented it along with its history (which was most interesting). He gave us addresses for places to have breakfast (we went there for all the 5 days) and a map with a water bottle and some snacks. When it got a bit cold and we asked him for blankets, we found them in the living room the next day. He also let us store our luggage in the room even though we had to check out on the last day. Truly, he did his best to make us feel welcome and succeed, thank you!!