We found this place a real mixed bag. Overall, it was OK - sufficient for our needs and a decent base camp for exploring Porto.
Here are the pros and cons of our stay.
Pros:
* Great location - this is most of what you'll be paying for, but that's fine if you like port cellars and rivers (which we do!)
* Comfortable beds - we slept well every night, and honestly that's probably the most important thing
Cons:
* The hot water in the shower lasted for less than five minutes. We contacted the host about this and she said it shouldn't do that, but we had radio silence afterward
* Tea, coffee and toilet roll was provided but only enough for a couple of our four nights, which we found to be a bit weird
* The listing said there were cooking basics, like oil, salt and pepper, but there were not... So we didn't bother to cook at the apartment, which was a good portion of the reason we booked it
I suppose I'd sum it up by saying the flat is good and the location great, but there's a real lack of attention to detail that could make it a great apartment in a great location.