The location of the apartment cannot be better! It's very central, minutes away from the metro, trams, the railway station for Sintra, the pedestrian main street.
The apartment itself is very comfortable, however there are minor issues:
1) dampness which causes an unpleasant odour especially in the kitchen - some form of heating needed for kitchen and bathroom for more guest comfort and to fight dampness
2) very small shower cubicle without any shelves where guests can put shampoo, etc while showring
3) ask host to ensure adequate bedlinen, towels, etc. are provided for the number of guests staying