For us it was a great place to stay. We moved around in Porto alot and this was or favorite spot. Maybe not for everyone but for us it was the perfect mix of being close to the city center (and the specific part that we enjoyed most) and still had a rougher flaire just around, which was great.
The size is nice and the walls were super fun to move around to make a space that we liked. Everything is there.
It is however in a big old coperative building, which does not have the charme of the more traditional buildings one could stay in. And is a one room apartment.
But we certainly enjoyed the clarity simplicity after all the small streets and beauty to be seen outside.