Overall a superb place to stay with prime location.
We stored our luggage in their office up the street before check in (it was a bit hard for us to find). Everything is a short walk away from the AirBnB.
The unit looks just like the photos.
You are right next to Sao Bento station which is a plus for public transportation and it's a key tourist spot, but you do hear some noise from it. Also, walls are a bit thin so we heard neighbors walking upstairs and talking. Nothing unbearable though. This place had everything we needed while we stayed in Porto for a couple nights.