We spent 2 nights at Helena's house and had a great time. Porto is beautiful and it was very easy to get from the house to the historic center (we had a rental car). The neighbourhood is nice and quiet and there is a supermarket close by which was very convenient. The house is indeed charming, and we especially liked the vegtable garden in the back. Helena was a great host and helped us make the best of our stay.
Obrigada!