Don't hesitate to book the flat, the situation is excellent! Furthermore, the appartment is cosy, clean with a nice terrace. The beds are confortable. You have all the necessary you need. We were 3 friends and have enough space to live well.
Filomena offered us a wine bottle when we arrived and gave us advices (visits & restaurants). She is really nice and the communication was easy.
If one day I come back to Porto, I will definitively book again this flat.