We had a good experience. Since we were blessed with good weather during our stay, we were able to take advantage of the balcony at the start and end of our days here. View of the cathedral was breathtaking, especially at night.
Place is compact but functional for short stays. WiFi is fine for normal usage but would probably be too slow if you wish to work remotely. Kitchen is tiny but we mostly ate out due to numerous restaurants in the area. Just two minutes away is a very good Pizza place if you want a break one night from the wonderful Portuguese cuisine. Bed was comfortable and the sheets had a freshly laundered scent. Bathroom was small but due to long ledge behind sink had plenty of storage for all your items.
As with any other apartment in Porto there are steep hills so be warned if you have heavy suitcases. Parking garage in front of nearby Torre dos Clerigos but due to hilly location it is a hike. Stairs down from ground level entrance to apartment one floor below.
Check-in and out process went well. Easy to get in to building and apartment with codes - no keys to lose!
Location is central for sightseeing. Walked to Praca da Liberdade and then followed audio tour down to river and across the bridge. Bring your walking shoes and a good attitude and you'll have a wonderful time in Porto and Francisco & Maria's apartment!