We had a lovely time in Helena and Artur's place. It's a very comfortable townhouse apartment less than 10 minutes walk from the Santa Caterina shopping street, a few minutes walk from the nearest metro stop and just one minute away from a big Pingo Doce supermarket.
Helena's husband Artur met us at the apartment and helped us carry the bags up. He then spent a lot of time showing us all the places to visit on a map which they had annotated for guests to refer to. We had originally hired a car for three days but after consulting their suggestions we decided to reduce this to one day as there were so many things in Porto we wanted to visit. Artur offered to help us out with parking which we didn't need in the end, but appreciated.
The flat is comfortable, modern and spacious and we used the kitchen most nights. It's up three flights and there isn't a lift so something to bear in mind for people with mobility concerns.
Helena and Artur are kind and considerate hosts, their flat is lovely and well situated for all the main attractions. We can thoroughly recommend their accommodation.