Apartment 18a is in a great location. It was very clean. It had air-con, decent shower, cool interior design. It has a terrace overlooking other accommodation rather than street life so it felt both quiet & private. I didn't have much problem sleeping but be aware that the walls to next door are not that thick and the sound will travel. I did not meet Sandra but this was not a problem for me. Overall I was very happy with my stay and would stay again if staying in Lisbon.