We spent 5 nights in the top-floor apartment of a block which seems to be managed by the same company.
Check-in was really smooth, Ruis was very responsive and flexible allowing us to move our check-in time due to an earlier-than-expected arrival. We were met by Anaelle who was friendly, helpful, and had some excellent recommendations for the local area. The glass of Port on arrival was a nice touch, best enjoyed on the small balcony with an outstanding view over the Douro river and Gaia-side of the city!
The apartment was clean, quiet (for us, though again we were top floor), and in a fantastic part of the city. Walkable to lots of great restaurants and bars, and a short trip down to the riverside. Only slight downside from our perspective was that we'd often get back in the evening to find that a smell of fried-food had filled the apartment (presumably from the restaurant). Not entirely unpleasant, but it did get into our clothes.
Other than that a great stay and would recommend!