Very nice place and incredibly well connected to the city as very near a metro station, we had a very good time spending the weekend there.
Only note for people who might get startled easily, when buses pass on the road in front of the house you'll feel the floor trembling, it hasn't been a problem for us and it doesn't give trouble for the night as there are no night buses.
For the rest the place is very nice and has everything you might need to have a nice time in Porto!