My husband and I have been in Gundega's apartment for a couple of nights. The apartment is very nice and clean, it has anything you may need, it has an incredible big and fancy terrace. The apartment is located in the center, the main parts of the city are reachable walking for few minutes.
At our arrival, Gundega and her partner Antonio explained to us a lot of interesting thing to do in Porto: a proper guided tour from the terrace of the apartment, which helped us planning our visit. They are also very flexible about arrival time.
My husband and I are very happy with the apartment and we absolutely recommend it.