We had a wonderful time in Porto at Sofia&Jorge's place. The house and the room are very nicely furnished, with lots of natural light. The place is very spacious and you will find everything you need (kitchen fully equipped, shower gel, hair dryer, etc.). Sofia welcomed us and was very helpful with tips on where to go. You will also find a book with recommendations, maps, and guide books. We were the only people staying in the house, so we had everything to ourselves, but the house is so spacious that other guests would not have been a problem. The location is perfect to explore the city on foot and also to reach the airport. The room is quiet and the garden lovely for a stay in warmer weather. Check-in and check-out are a breeze.
The only downside is that the house gets very cold and humid in the Winter (we stayed in Feb and had rainy weather), since it is old (although fully renovated) and does not have central heating. Electric heaters helped a bit, but still plan on bringing extra (warmer) clothes to wear in the house.
Other than that I can only fully recommend Sofia&Jorge's place, it was perfect.