We had a great time in Porto, Anas apartment is really nice. There were a few things we absolutely loved and some things that weren't as perfect.
Pro:
Location, location, location! It is located in a quiet street, right in the central of the old part of Porto. There are several Restaurants and bars in a walking distance, and every place we've been to got great food, wine, was cheap (compared to Stuttgart) and was filled with nice people.
The view from the apartment is stunning. Facing the sea and the river, we were able to end every evening with a beautiful sunset.
Everthing was clean and spacious. The bed was really cozy and comfortable.
Cons:
As other guests had mentioned before: there is only a small heater, so the apartment can get a bit cold. Using the heater and the water heater simultanious resulted in two power blackouts. The fuse box wasn't to be found in our apartment. The neighbours from upstairs took care.
There's a bar underneath, playing music til midnight. Nothing bad, but it would've been good if we'd known that before.
Also the shower is tiny and the door won't close.
Overall we've had a great time and would love to come back.