The apartment was located in historical center of Porto, and most of the places we wanted to visit were within walking distance. The studio was beautiful, clean, and had everything we needed.
Girafa is a great host, she was helpful and suggested plenty of places around to visit. I would definitely come back to this place! It felt like somebody took care of us :D
One tip though - there is not much parking options around the apartment, but Girafa also suggested one paid underground parking which was about 5 minutes away by foot. Generally it felt like Porto center is not the best to go with a car (like many other city centers, but Porto did not even have much paid parking spots on the streets). If you go with a car, the parking options should be checked in advance.