We really appreciated Maria waiting in for our (late) arrival, taking time to show us round the apartment and then mark up a map and brief us on the best places to see, eat and where to get groceries etc; it was a big help in getting us started.
The apartment is a good size, spotlessly clean and well located in a quiet area but close to all of the key sites in downtown Porto; we have no hesitation in recommending it and would happily come back and visit again.