The apartment is exactly how described. Though we arrived quite late, the check in was easy and fast. Eduardo organised a transfer and as we reached the address someone was already waiting for us.
I would say that the highlight is its location. We reached everyplace by foot and there are small shops and restaurants just on the corner.
If you have a lot of heavy luggage or a baby stroller, be aware that the stair is quite steep.
All in all, a great small apartment to stay in Porto.