The place is ideally located in the city centre, right near the Castelo wall. You can feel a real atmosphere of Lisbon here. The apartment itself is very clean and perfectly equipped, you can find all stuff that can be imagined here (especially in the kitchen). The place is quite small, but nice for our group of 3. It matches the description 100%. There is a restaurant nearby and in the evenings it can be a bit noisy, but it is possible to sleep quite well.
Although we didn't met Sandra (Diana welcomed us at the arrival), she was very responsive and helpful and gave us extremely detailed description of the route to the apartments. Definitely recommend this place!