We stayed at the hostel for just one night but it was the best experience we've ever had. The place is amazing: clean, comfy and full of super-nice people. The staff was very nice and always helpful. The common area is beautiful with so many things to do and so many people to meet. There are a lot of events promoted and/or organized by the hostel and you have to do them, they're definitely worth. The location is just right, right in the heart of the city and next to bars, restaurants and everything you might need. If I have to point out some flaws one was that the wifi didn't work in our room (last floor) and that if you want to go to sleep early that's not definitely the right place since it's so close to bars. I totally fell in love with this hostel, and if I'll ever go back to Porto that's where I'll stay.