This Airbnb is absolutely amazing! Right in the middle of the old town, only a couple minutes away from the marina, the bridge and public transport. The best about this Airbnb is clearly the terrace as you can overlook the Duoro River and the old town. You get free concerts at night from street musicians and don't even have to leave the house to take the best picture possible of Porto!
The only little downside for us was the sofabed as it appeared a little old already and was not comfortable for two people to sleep in.