I had the pleasure of staying at this residence for 45 days and I can only recommend it to future guests.
Célia and her family went through great lengths to welcome and make me feel at home, both upon arrival and during the entire stay. I was immediately helped with any practical matters that arose, although these were very few.
The room is perfectly equipped for a long term stay, it is cozy and bright with large windows directed at the green garden just outside.
Although the room and garden is technically part of the rest of the house, it feels closer to living in an actual private residence, since neither Célia nor her family will frequent the guest areas when there are visitors. In fact, they all did very well to respect my privacy and made sure to text beforehand in case they needed to make a quick run to the garden.
Guests should notice that the kitchen and bathroom (both only used by the guest) are located outside of the room. This was in no way an issue for me, but might be relevant to consider if visiting in the colder months.
As for location, you are obviously not in the city center of Porto and the residence is a bit far from supermarkets and other necessities. However, the area is nice and relaxing with a lot of natural sorroundings. Furthermore, there is a metrostop within 5-7 minutes walking distance which takes you directly to the center of Porto (20min ride). In this way, it is possible to enjoy a calm neighborhood while being easily able to visit the centre of Porto.
People with allergic concerns should note that both a cat and a dog live at the house (the dog is not allowed to enter the garden nor come close to the room).
All in all, I highly recommend visiting this place as the room is great and Célia and her family is even greater. I hope to visit again sometime in the future.