Location, location, location! Gorgeous neighborhood right next to the river. It is a large flat and I'd recommend booking it for 3+ people. I'd say the street is medium busy -- not full of bars but not tucked away -- so there is some road noise but the windows do a good job of keeping the flat quiet. It gets cold at night even with the heaters provided, but I imagine this won't be a problem in summer. Be prepared to climb some hills in Porto and have a great time at this flat!