Whether you want to stay in Portugal and want a tourist experience or a local's experience along the coast of Lisbon, this is the perfect place. My family (Husband and 4 year old) stayed for a month in the apartment in August and it was one of the best stays in my years of travel. The apartment is literally 5 minutes walk to the beach (maybe less), 10-15min walk to the train station, 5 min walk to a mall with a full grocery store, pharmacy, laundry, stores and restaurants (and even 5-10min walk to two small playgrounds). Its perfect for a family staying with small children. Car truly not needed. Literally, if you don't want to take the train, you can just use Uber or Bolt apps to get anywhere along the Lisbon coast (including Sintra) in10-25min. Its truly in the middle of everything. I felt like I never left my real home with all these conveniences.
I was worried before we arrived about it having no air conditioning in the hottest month of the summer. But, with the house so close to the water, the temperature was literally 60F at night and 70-80F during the day. Plus, the sun never fully shines directly into the apartment. So, with the windows open and just one fan running, we never felt hot once! Its just a wonderful place to stay, and the owner and property manager were so helpful.
There are literally only two things that I mentioned to the owner and the property manager that were cons. The first is that the main shower drains slowly, so its hard to take a shower in it. However, its my understanding from the property manager that they are already planning to fix it. Second, with the convenience of the location, of course comes loud road noise in the AM. But, the neighbor's dogs and the car business across the street's dogs were a major annoyance in the first week. But, after a while, like everything, you get used to it. Great place, great support, you will have a great time living here.