Marcos place is Amazing.
I spend there one month working remotely and cannot imagine a better place in Porto. Location is perfect. Cedofeita is my favourite area in Porto. Lots of galleries, bars, restaurants and cool shops, close to all historic places, supermarkets, etc. The flat itself has everything you need for longer stays and remote working. Internet is super fast. It has everything for cooking, even a Wok and a blender., Umbrellas for the rain and tupperwares. Super clean and tidy and tastefully decorated. Quiet at night. They were super helpful all the time.