The apartment was very well presented and very clean. It has a small but well equipped kitchen, and is close to a Lidl for getting food if you're on a budget. It is about 5 minute walk to the nearest metro (Casa De Musica), and across the road from a bus that will take you to the beaches. Due to the location we were able to explore central Porto as well as the outskirts.
The only downside was being positioned on a main road, which means you can hear a lot of pedestrians and traffic. So if you're a light sleeper, it might be difficult for you. The bed was comfortable (but quite firm) with plenty of soft/firm pillows provided. There is also air conditioning and lots of storage space, in the form of cabinets, a wardrobe and drawers.
We enjoyed our stay and would recommend this place to others.