We had a very pleasant stay in this apartment, it was even better than we expected based on the description and photos. Location is in a small and quiet side-street right next to the train station (almost no noise) and less than a minute walk from the busy streets of the city center of Porto. The appartment was also very clean and had a nice balcony where you could sit.
The whole staff was very communicative, helpful, and knows a lot of the places-to-be in the city (even if you think you have seen it all).
All-in-all, we would very much recommend this place!