The apartment is right at the center of Porto, only about a 10 minute walk from Ribeira, and 3 minutes from Livraria Lello and Iglesia de los Clérigos; making it extremely convenient to access main tourist attractions. The apartment itself was good. It gave more of a hotel room vibe than home vibe, but it had everything we needed for a short stay (5 days).
There were some slight personal downfalls. First, the building itself is slightly uphill (like most buildings in Portugal), but after dragging around our big luggages in hot weather, it was awful to find out there was no elevator in the building and our apartment was on the last floor (3rd FL).
Second, there is A LOT of construction happening in Porto right now, which made it a headache to access the building. So word of advice, don't follow Google Maps entirely. It'll lead you right to the construction.
Lastly, because the building is right at the heart of Porto, it was slightly noisy during the night (BUT ONLY DURING THE WEEKENDS!) that it woke me up instantly because I am a light sleeper.
As for the construction in the early morning and during the day, there was minimum noise that could be heard in the apartment, so that was good.
Overall, I would consider staying here again for a short stay because the hosts were very responsive and kind. They have an office that you can leave your luggage at should you arrive earlier than your check-in time or would like to stay later than your check-out time!
Hope this was helpful!