I visited Porto with 9 friends and stayed in Joana & Luis' apartment. The apartment itself is beautiful - it's very light and spacious and decorated very warmly. All the bedrooms are large and the living space is huge and very sociable. Both bathrooms are large with power showers. It looks exactly like it does in the photos!
Joana and Luis were excellent hosts and responded to messages within the hour at the latest! They were on hand at all times to offer useful tips and help with airport transfers, groceries and breakfasts. They even welcomed us with a lovely bottle of port to start the trip off!
All in all, I highly recommend staying here.