We flew from Eindhoven (Netherlands) to Porto with 9 people for the weekend. Aida's apartment is great and offers all you wish for at a short stay: it's spacious and has got 2 bathrooms. It's central and at walking distance to the city center at the river (one way) because you go downhill. Going back by taxi is cheap (just 6 euro's).
Aida is a very nice landlord and helpful. Before arrival she gave us some good suggestions where to go to in and around Porto.
So it's is a great spot which I strongly recommend!