Garden House is exactly how people describe it below - tranquil, calm and peaceful. It is tastefully decorated, cool (for those visiting in the summer months) and comfortable. It is also extremely secure for those who are concerned about safety (although Porto itself is incredibly safe).
Downtown Porto is a short walk (or even shorter, and very affordable, Uber journey) from the centre of town and the historic riverside. Jorge took the time when we arrived to mark up a map with bakeries, restaurants and specific sights we might wish to visit upon arrival. We took several of these recommendations, and they were excellent. This was particularly helpful as my girlfriend is vegan, which can prove difficult in Portugal.
Overall, I cannot recommend the stay highly enough to people. Porto is lovely and this house is a great base to explore it from. Thank you once again Jorge.