We loved staying at Fernanda's very clean, beautiful, and cozy apartment. She was very accommodating; met us at the place upon arrival and she let us keep our luggage past check-out time since the next guests were not arriving until later.
The kitchen, the bathroom, and linens/towels were well stocked. Can't think of anything more I could have asked for.
We stayed here in the winter and it was warm and cozy; there are space heaters also if you get a bit cold. There is a heated towel rod in the bathroom!
There is also an elevator in the building in case you are tired from walking around Porto.
Great convenient location - very close to a couple of Metro stations and 15-20 minute walk to Sao Bento station.