David was a great host on this 3 hour (one uphill and one big lot of downhill steps) historical overview of Porto. We covered a lot of sights on the eastern side of the city including the railway station, Cathedral, another lovely church, a walk through the Ribiera district and out onto the top level of the bridge. David provided a lot of information about the history of the city as well as its lifestyle today. He was very friendly and enthusiastic, helpful with local tips. A great option to visit and learn about Porto.