For me the house of Alberto and Aurora was a perfect place to stay in Porto! Although you you can reach it easily from the centre by foot or bus, it is very quiet.
The both are so nice and friendly people and the place with it´s wonderfull garden so unique, that I decided spontanously to stay longer. At least I have been there for 5 nights and enjoyed the very nice ambience. They handled many things for me, like renting a bike, calling a taxi and so on. I travelled alone and here I felt like staying with friends.I recommend Aurora as a very nice host, if you are searching for something especially, stay here!