Contact was very good and fast in excellent English. Always friendly and very willing to enable us a stay as comfortable as possible. Description of the appartment was detailed and the equipment was very good. We had a great time there and can fully recommend this flat to other travellers :)
There was only one counterpoint: On the other side of the street there is a soup kitchen for homeless people or people who are in a bad social situation. As well there are some dubious bars in the neighborhood. For us, that was no problem...but maybe for other people it could be...
But all in all we had a very great time there, fully appreciated the appartment and the contact, and if we will return to porto someday, we would try to get the appartment again ;)