The location of the apartment is very good and central. A negative point is the smell of the bathroom. The shower has mildew stains, I guess that's where the smell comes from. Also there isn't too much light in the apartment, since it only has one window (but which is very big). Communication with Maria and Ines was super easy. When we arrived two lamps didn't work and Ines promptly fixed the bigger one (but we didn't mind the small one being broken). They also provided helpful tips on sightseeing.
I overall recommend this apartment. The problem with smelly bathrooms seems also to be a problem in other Airbnbs in Lisbon