The apartment is great for a family with two kids. It has everything that one needs and is located really close to the key places to visit in Porto. We are traveling by car and needed the parking. Once you park your car, you don't need it anymore because everything is walking distance.
The most important however was the hosts. They were very kind, they waited for us even though we arrived late and gave us great tips. They were always available. I highly recommend the place.