Our time in Lisbon was great and this apartment was the part of our enjoyment. Casa das Muralhas is very clean, tidy and has everything you need for few days stay. Location is great too (near city center, inside old castle walls). It was very romantic and interesting to live in the really old historical place. And hosts were friendly, responsive and flexible with our late check in time.
This apartment might be a little small for 4 adults with a lot of baggage, but anyway it is very cute and worth staying!