TL;DR This apartment is an OK deal to explore Sintra coast for 2 nights.
Joana is a responsive and flexible host.
Regarding the apartment, the description is exact but... misleading.
"Misleading" is rather subjective. That's why I would understand if Joana would like to counterargue with her perception.
Let me explain: First it's no more a "beach house" than any other apartment along this road. It's not a house and it's not on the beach. The ocean is indeed visible but through a narrow road from one window... and you will have to abstract the parking lot under it. Charging 60€ for cleaning let me think that there might be "something" special to clean, but I'm still looking for it. The building itself might please architects who like retro but this design is not aging well if you ask me. Don't expect too much from the kitchen (see other reviews for details). In short, if you rent this place to live outdoors and enjoy the fast wi-fi only to call your mum, it's an OK deal.