I spent a month here in the winter and it was exactly what I needed. Diogo's place was the perfect size for solo travel, and both the kitchen and bedroom receive direct sunlight for practically the entire day, which really brightened up the room and my mood every morning.
The kitchen was outfitted with everything I needed to cook regularly (I'm a home chef), and laundry was a piece of cake. I loved hanging my clothes outside to dry on the lines outside the front windows!
The location was ideal -- you're near to both the Cais do Sodré metro/train station/ferry and the Tram 28 (though this was often too crowded during the day to be preferable to just walking). There was nowhere I couldn't get to in more than 20 minutes either by walking or public transit.
The restaurants nearby were amazing, and the miradouro just up the stairs (like 1 min away) were a fantastic places to view the sunset every day.
10/10, would stay here again.