We had a great time in this very well-done stylish space. The views are great, the hosts give a great introduction to help you get around Porto. As others have mentioned, it is on the top floor, about 60 stairs to get up there, but you are already climbing a lot of hills in Porto :-) It is about a five minute walk to the Ribeira, but there is a lot of great food just steps away.
This place is great for a couple, or family with a child who is a bit older. Steps up to the loft bedroom are a bit tricky, but that's the only drawback in a place with great views, a quiet location, and close to the action.