I had a great stay at Esters apartment in Lisbon. The location was excellent, close to everything. The apartment was big, kitchen well equipped, the aircondition working great and it was very clean. There was even a washing machine and a nice view.
Esther was easy to communicate with before and during my stay. She replied fast and came up with solutions right away when there was an issue.
Despite being a great place to stay, it also had some cons I think it is fair to mention.
It was noisy. If you are looking for a good night of sleep while in Lisbon, this is not the apartment for you. The windows/walls are nothing close to sound proof, and there is a sportsbar (as well as other bars and restaurants) very very close, so people were cheering until late. It was also construction work going on at the neighbour apartment starting in the morning around 8 am and continuing throughout the day.
None of the doors to the toilet and the bathroom were closing properly. For me it was not an issue since I stayed there by myself. But if you are staying more people, you might want some privacy, and here you will not get that.