We enjoyed our stay in the apartment and particularly appreciated the communication from GuestReady. The apartment is amazingly located in Porto - we barely used any public transport and could pop by the apartment during the day between two visits.
We had some issues in the apartment, which some could be expected and others were a bit disappointing. As the place is very central, expect noise from the street, but also from the building itself as the walls felt quite thin. We were also expecting more based on the description: the amenities were quite minimal (two bags of tea for 3 nights, no coffee, one single soap for hands, body and hair, etc.). We appreciated the bootle of wine though! We also had some issues with the bathroom (blocked sink, dripping flush).
Overall, the apartment is a good choice for those who spend a few days visiting Porto, but doesn't feel like a place that would be appropriate for long stays, or for more than two people. It feels like an apartment that is only used by tourists for short stays. If you are a couple / two friends who will spend the weekend visiting Porto and planning to walk around, this place is good!