We had a great time in Lisbon and enjoyed staying in Sandras apartment alot.
The apartment is extremely well located and you can basically walk to many of the main sights by foot.
Bathroom and kitchen are quite small - so we would recommend the space for 2 people, however bedroom and dinie room are quite large.
The street was a bit noisy, but with closed windows you couldn´t hear a thing, so we would definately recommed Sandras place for a weekend in Lisbon!