Marco and Carla's place is just a stone stairway away from the riverfront with restaurants, tour buses, city buses, and trams. It's a short walk from Rua das Flores and Sao Bento Station, among other exciting spots in Porto. One weekend wasn't nearly long enough! And Marco and Carla were most helpful in answering all sorts of questions, providing in advance all sorts of answers to questions I hadn't even thought of, and then, when my Uber order fell through, Carla ordered a taxi for me. I have only good things to say about Marco and Carla and the Invicta Flat.