I have a very mixed review of my stay in this rental and did not love it as much as all of the other reviewers...
The good: Great location, very central to the train station, restaurants and shops. Very clean. I enjoyed the pastries on my door in the morning. I also enjoyed the option for someone to do a small bag of laundry for me so I had clean clothes on the trip home.
The bad: You should know that "charming little alley" shown in the photo is actually FULL of tourists all day long as it is one of the main walking paths up to the main cathedral. I don't mind hearing tourists but they are staring in your door at you as they are coming down the steep hill, most of them taking photos of the building... BECAUSE there is a sign on the balcony above this one from an owner I'm guessing who does not like having a guest house below her so she has hung a sign that says this guesthouse is full of mice and hung her underwear and other items around it. I had hoped so sit and relax in the rental and watch the beautiful alley and instead I kept the doors closed since it was awkward with people watching you.
Also, staff working in the building seemed very loud. At one point, one of them was two floors lower than me but was screaming at someone SO LOUDLY that I could hear her in my apartment with the door closed and two fans running. It was very unprofessional.
I would NOT stay in this apartment again if I came back to Porto.