Joao's place is an amazing flat in the hear of Porto off of the river. The location is great for access to the waterfront and other nearby amenities including some amazing restaurants, shops, and landmarks for site-seeing.
The flat itself is very clean and has everything you need to relax and enjoy your visit. There isn't much more to say as it met all of our needs and we were very comfortable. The view and location makes it a great spot to hangout throughout the day and listen/watch the city streets and Ribeira Square.
I would 100% recommend staying here!