Mario's place is really close to Rua de Santa Catarina, but still quiet and peaceful at night. The apartment is neat simplized decoration, which is suitable for relaxing stay after a laboured walk in downtown. RECOMMENDATION must be mentioned is Mario himself designed an app for Porto city tour - Mario's Porto Route, which is an elite guide with map and site info, accesible on playstore and applestore. I came to this city alone, followed the route and found out surprising hallmarks everywhere!