My three friends and I stayed at Carlos and Cristina's for two nights when we visited Porto. The flat itself is absolutely beautiful, modern and clean, exactly like the pictures online. Carlos and Cristina met us, explained the flat (with was full of many nice touches, including tea and coffee for the mornings!) and gave us some great tips for dinner places. They made sure we had everything we needed and were quick to respond to any questions we had via email, usually within an hour. The flat itself is located in a perfect location, about a 1 minute walk to the river, which is lined with shops and restaurants, and about 8 minutes from the university district (with more bars, clubs and shopping). We had an amazing time, and will definitely be coming back to stay in the future. Thanks Carlos and Cristina!