We had a great stay! Charming and cozy apartment, all facilities you need (comfy bed, kitchen with all necessities, bathroom w/ towels, AC, and even a dishwasher). Also on a great location: quiet but near most highlights of Porto. However, be aware that the church next to the apartment rings its bells from 8 AM.
The only point for improvement was the WiFi connection, which was really slow, would not recommend the place for working from home.