Really, really great location, with some amazing restaurants nearby. Walking distance to all of downtown Porto basically.
The two of us found it a little small for the month we stayed, probably better suited for short term stays. Sharing the washing machine with others is not ideal, also no dishwasher and a very small kitchen. There was also fair bit of construction going on in the buildings nearby, but noise wasn't a big issue. There was some noise at night but kinda to be expected being so central and it was never really that bad.
All the above are only minor things and in general it was pretty good.