We had a great time in this Porto apartment!
The apartment is conveniently located between Marques and Faria Guimaraes metro stops. From Marques you can also take direct buses to Campanha station and Foz.
The apartment was clean and perfect for a family with two small kids both size-wise and equipment-wise. A travel cot was also really helpful.
The host Joao was also super nice and responsive. He also brought us a new water cooker right after we found a problem.
Perhaps the only downside of the apartment is that it's pretty noisy at night when windows were open due to relatively heavy traffic of the street front of it. My kids were ok, but others may find it otherwise.