We stayed 3 nights in Porto at Paulas airbnb. We felt very relaxed in her house. Slept very well , it is quiet and very clean. The room, kitchen area and little livingroom are designed with taste. It is easy to walk to Paulas from the Metro.
Paula and her husband Sergio were very helpful with bus, train information and other turist info. If / when we come back to Porto we will gladly stay at Paulas again.