We had a really nice stay at the apartment. Sarah's communication was always prompt and she was helpful.
We had some issues with the location of the apartment because its located without direct road access outside and we had a large amount of luggage. It was tricky to convince a taxi company to collect us as there was so little parking or space to load close to the property. If you were travelling with a more regular amount of luggage then I guess it wouldn't be such an issue.
Overall I recommend the apartment and Lisbon is an incredible city to visit.