I was only there for one night, but except for some street noise in room 1, which was easily resolved in me changing into a vacant single bed room, it was a fairly pleasant stay. By the way for those who travel by car: There is free all day street parking on R. Moreira corner R. Alegria, otherwise it's paid in car parks or 4h max on the street (but free between 19:00-9:00). Enjoy Porto!