Even if we couldn't meet Christiano, Ana helped us in every possible way. We enjoyed our stay in Porto and recommend it anytime.
If you are in town by car, the best solution for us was to park it on a park&ride place near the metro line D and use it only if you need to. The parking situation is very bad or very expensive (parking lot).
The Wifi didn't worked all the time, but it wasn't a big problem for us.
Happy to be there a second time.