Everything has been already said in the all so many reviews but just to repeat history: Alexandre's apartment is just amazing. Exactly like the photographs but touched by romance and time, charming by its old and authentic features, great and comfy beds and a terrace with a breathtaking view to die for. Everything you need is there. On weekends (Friday and Saturday) the river side gets a bit noisy by loud music but not annoying, and the trams passing the bridge can be a little loud but blends in with the sound of birds fairly quick and the view makes you forget.
And let's not pass by on the host himself, personally I would have taken him along to visit all the great places he suggested, he's as charming if not more as the spaces he offers. Will definitely come back when visiting Porto again!