The apartment is truly awesome: the most incredible view to one of the most beautiful rivers I ever seen (more than fantastic, the boats and the funicular on the other side of the river, coming and going all the time, make it as sweet as a scenario). And you can see all this lying on the (quite comfortable) bed; just be careful not too kick the bed as you get up (it's somehow very easy to do it).
The location is just PERFECT. Besides the view, it is on a lovely very old street and a few steps from the riverside (itself and attraction) and its bars and restaurants (plenty, cosy, and very nice, though not expensive), also breakfast and market were never a problem to get nearby, nonetheless it's also great for getting everywhere...
The living room is very cosy (same view...) and the kitchen great.
Mariana gave us very nice tips, and a bottle of Vinho do Porto was a warm welcome.
Not so positive: when my girlfriend and I first got there it seemed too 'built up' (too much purple around and poems on the walls are a bit exaggerated (a place with great granite walls don't actually need this kind of 'help'); it doesn't look like a home, probably it isn't), but it looks (even) better at sunlight, which makes it up for everything.
Nevertheless, the apartment and the nearby are really romantic. I would stay there again in heartbeat.