It was my first stay in Porto. And I really enjoyed it :)
The apartment from Ana+Daniel is perfectly situated. You can reach almost every spot in Porto's city centre by foot. The apartment as well as the checkin (Daniel picked me up directly at the Trindade metro station and showed me the shortest way) were very nice and friendly. And inside you find some little extra's like a bottle of water, some port wine to taste, a list of local tipps, a map and a city guide.
I can really recommend that airbnb flat! And, in addition: the Negra Café as well as the Tapabento restaurant near by (-> little more expensive, but the food and service were outstanding!).
That surely wasn't my last stay in Porto..