The apartment was clean, newly renovated and located near the city center. It did however smell a bit of mold and we weren't told beforehand about the touristic fee of 25 euros that we were asked to pay in cash once we arrived.. This is something I would expect to be already included in the prepaid-fee, and it gave us a bad feeling having to pay this fee in cash without being informed beforehand. The host also seemed annoyed with us when we arrived and told us we arrived earlier than she had expected (although we arrived within the hour we told them we would arrive).
Furthermore the description does not mention this is actually two separate apartments, rather than one large apartment - there is a separate one beedroom apartment in the back of the house that is pretty nice. However there was no way of getting out to the streets nor into the main apartment from the back. The door only opened from the inside which is pretty inconvenient since we had to be on the same schedule and be dependent of eachother. Also, it's kind of dangerous if something would happen, like a fire.
Overall, it was an okay stay in Porto, in a clean apartment, but it wasn't the best stay. There were some things like that there was a nice looking coffee machine, but no pods provided for it, and when we asked where we could get them, we were told in a supermarket on the other side of town. And the kitchen utilities breaking when we tried to use them (like the bread knife when trying to cut the bread). Small things like this resulted in a negative effect on the overall impression.