Nuno' s place is fantastic for students and solo travelers like myself. He was always a text away if I had any questions. Nuno himself is a very personable host and shows great hospitality. I had good conversation with him when I did meet him!
The room had it's own bathroom and had access to huge common areas like the kitchen, and downstairs common living room, and a deck with outdoor seating. With the shared areas, the only minor blip was "college-student-level cleanliness" in the kitchen... but that is only dependent upon the other guests that are there during the stay. It was easy to get laundry done here, too - definitely a plus.
Location was central to anything you might want to do, never more than a mile walk anywhere. I had an excellent stay in Porto and found this to be an excellent choice for solo travels.