We had a wonderful stay at Cristina's place.
The location is great! in the middle of the main street and few meters from the metro station. The little balcony to the street is awesome.
The check-in was very quick and informative, Cristina is very nice and available (works in the shop below the apartment). The apartment is very spacious for a couple and all is new and clean. We even received a very sweet welcome present :)
This place is a great choice to stay in Porto - we 100% recommend!