Apartment is located in city center. You can go anywhere in 15-20 minutes by walking. We never used any public transportation during our visit.
On the other hand, apartment close to bars and clubs. So during night and to be honest till morning, there are too many music and drunk people noise in the room. If you will stay during winter, there will be no problem. But we stayed in July, so we had to open window so it was a little disturbing to try to sleep with that much noise
In addition to that water pressure in the bath is very bad. Even I had a short hair, i has a difficult time to have a bath.
Porto is a beautiful city. That’s why we didn’t care too much for this kind of problems but you should be aware of this kind of problems before booking this apartment