The location is great, we could walk anywhere we wanted without problems. Right infront of the door is a bus station so that was good too, also the metro is like 5 minutes away, but Ubers are so cheap in Porto so we used that to get to the beach etc. Right next to the apartment is a supermarket and a restaurant which was really practical. Also three cafes nearby.
The apartment is big, and we liked the fact that it had a balcony. It gets kinda loud at nights, but that has nothing to do with the apartment, it was just Porto in general.
We had trouble with the check-in at the beginning, but after talking it out, it got resolved. They were really fast with answering and meeting our needs, and we got nice restaurant tips from them. If you have a budget you should consider it, because the apartment was good for the price.