The owners can make little effort to provide more details on directions to get to the place and also how to open master key locks, not everyone is operating these on a daily basis. If you are carrying a 23kilo suitecase ask for the ground floor apt. Else be prepared to climb 1, 2, 3 or 4 floors with the suitcase, depending on which unit is available.
Location is great in terms of acessibility to the bridge or to the station.
There are no AC units in the apt.
Overall, i guess it was a decent stay. They could do better for the guests with parking availability for guests with car, directions to get to the place and if possible few tips on what to visit and how to go about. This will perk up the experience of visiting Porto.