We had the perfect stay in the Red apartment, we were greeted by Katia who is a 'pocket rocket', always running around with a smile on her face and happy to assist guests in any way.
The apartment could not be in a better location, the balconies are right on the river front, the views are spectacular. We stayed for a week, it rained only on one day, but it was perfect to sit on the couch, read a book and watch the boats pass by below.
The apartment is bright and clean, it is reasonably quiet, but there are restaurants below, so may be noisier in the hotter months.
We highly recommend the apartment and would love to stay again should we return to Porto.