This is a good location, just steps from the Sao Bento station. The street, itself, is quiet, near a small Halal market (easy for an emergency supply), and a small cellphone shop. There is only a little vehicle traffic, and some foot traffic on the street. Easy access to much busier areas with lots of shops and restaurants and "historic city center" 5 minutes away.
The apartment was clean, and as pictured. Porto City Hosts were very quick to respond, and allowed us to store our luggage at their office, as we arrived several hours before check in time.
We felt safe and comfortable in this unit, and it gave us easy access to things to do. About a 20 minute walk to the Ribeira (riverfront).