Location, location, location! Everything you need to see in Porto is within a short walk from the flat, it's amazing. The downside of that is that the street downstairs is VERY busy day and night so make sure you bring some earplugs if you need silence to sleep (we weren't too bothered).
Very easy self check-in, flat is well equipped, clean and convenient.
The coffee machine was leaking and one towel could have been in a better shape but overall we had a great time.