My stay at Casa da Madorninha was great. The place was very clean, Carmo greeted me and was very nice, she gave me directions of nice places to visit while in Porto and made me feel welcome.
The place is good, the room was spacious and the bathroom was very clean. The kitchen had everything I needed.
The location is also great, it's close to the metro and it has supermarkets and a shopping mall right beside it (it has all the shops you can possibly need). It's easy to get from the airport and also to go to the city center).
I definitely recommend staying there.