We visited Porto in my family, including our two kids (a 3 years old boy and a one-year-old baby girl), and parents.
Our stay in Pedro and Paula's apartment was excellent.
The apartment is very clean and well equipped.
It is very well located and has easy access to the metro and also the main touristic attraction in the old part of Porto.
Paula was very concern with us and our well being. She borrowed us an additional stroller so that we could carry our two kid during our Porto sightseeing.
In summary, our stay in Porto was very pleasant. When we come back to Porto, we will surely stay in Pedro and Paula's apartment again.