Modern luxury in a fantastic location. Best hostel we have ever stayed in. The room was clean and the bed was very comfortable, and the other guests quiet. All of our communication was with Antonio - very quick responses and great suggestions for parking nearby as well as activities. The apartment location was ideal - walking distance to historic landmarks, world class dining and the main metro station is directly across the street.
Tips - the street can be noisy at night as there are lots of bars nearby, but usually quiets down by 2am. Take the Porto Walkers free tour (they work on tips, which we gave €5 each) - fantastic guides and hits all the highlights.