We had a good stay in this apartment. It is spacious and nicely furnished, the kitchen is well equipped. The apartment has everything you need for an enjoyable stay. The apartment has plenty of storage space, I particularly appreciated nice little details - many hangers, good quality towels, etc.
The location is good too - close to centre of Cascais and a big supermarket.
Mariana is a very good host, she is very helpful, responds quickly and does her best to make your stay enjoyable.
The only issue for us was the noise, the apartment block is situated on quite a busy road and if you open the windows you hear the noise of the cars. We stayed there in August, it was pretty hot in the evenings so we had to open the windows for the night and we could hear the noise of the cars. But I am quite sensitive to noises, may be for somebody it wouldn't be an issue at all.
Overall this apartment is a good option for a holiday in Cascais.