Mariana met us to show us the appartment and give us the keys, she was very accommodating and met us late at night, as our plane was scheduled to arrive at 23:15. The apartment is super cute, though it would not be suitable to someone with limited mobility due to the stairs. The location is beautiful, and the view from upstairs is absolutely spectacular.
The only issue was that due to the age and lack of insulation of the house, it was a bit difficult to keep the temperature at a good level in the appartment - but this was in December and should not be a problem in the warmer months!
All in all, it was a great stay, and is a cute little apartment to serve as a home base while visiting Lisbon!