My family and I really enjoyed our stay at Edwin's flat - first of all have to mention that his mother/co-host Maria Olinda is one of the friendliest and most welcoming airbnb hosts of all time! So nice to be met in person after our trip, and by such a warm and funny person. Maria Olinda's communication throughout the stay was note perfect and she even offered to look after our kids for one night, what a gem.
The flat itself is everything other reviewers have mentioned - very large, clean and nicely set up - you will be v comfortable here. Having the balconies was a big plus and the beds were comfortable. There is even a double shower in one of the bathrooms. Something to note as well if you're travelling in the summer, there is aircon in all the rooms, which is not always a given.
The apartment is in a quieter residential part of Cascais but it's a easy 15-20 min walk to the waterfront, and you can do much of this via a lovely park (Parque Urbano do Outeiro da Vela) which also has a great kid's playground. We found walking down in the morning was ideal and then jumping on a bus or uber for the 5 minute ride back in the evening worked well - definitely recommend checking out the giant supermarket Auchan near the train station which has absolutely everything you need for the flat/the beach etc. The bakery Sacolinha which is a 30 second walk from Edwin's flat is great, as is Milkees which is about 10 min away. If you don't drive, definitely catch the bus down the road from the flat to go to Guincho beach - what a place. In summary this is a great apartment, in a nice and quietly upscale part of Cascais, and you couldn't ask for a lovelier host