We where 3 people staying at Cristianas place for 3 weeks during July. Great location, the apartment is 1 min walk from the train station, supermarket, pharmacy, dollar stores, dry cleaning, barber and Portuguese BBQ joint. It is also a 5 min walk from a good gym and the beach. The train takes 30 min to be in the heart of Lisbon and 10 min from Cascais city center. The apartment itself is clean and discreet, with all the facilities and kitchenware you will need to live there.
The beds are comfortable, clean and Cristiana changes sheets and cleans the apartment once a week. I never had problems with the Wifi or shower. Overall very happy with our stay at Cristiana. So I recommend this for anyone wanting a perfect place to explore the coast of Portugal from Lisbon to Cascais.