I enjoyed one month in November in Cascais, working remotely and surfing. As for the location, distance to the station is about 15-20 minutes on foot, depending if you are going down (to the station) or up (from the station), but the buses are close and very frequent if you don't feel like walking. What I really loved there was proximity to Lidl, discount supermarket with items of great price to quality ratio.
The place itself was not luxurious, but provided all the basic necessities: electric stove, oven, fridge and freezes, microwave, hot sandwich maker and a drip coffee maker. I missed having some better pots or pans, and the washing machine was giving some weird errors sometimes, but it was usable.
As far as cleanliness goes, this was really not its strongest point. All the communal areas were cleaned well and quite frequently, which was great. The closets were a bit dusty when I arrived, but that was not a big issue. The big problem in my opinion were the bathrooms which were really moldy, the air was stale and it often smelled like mold too. There was a fan in one of the bathrooms, but it didn't seem to work too well. It’s not a very pleasant experience, and I would be wary if you are allergic to mold.
The internet was super fast (over 100-200mbit) and went down only once or twice in an entire month for a total of maybe an hour or two. The host was friendly and communicative, I’m sure he’ll try to help with any wishes you have during the stay.
All things considered, in spite of the issues I mentioned, you’ll be hard pressed to find a place with price to quality ratio on this level. Furthermore, I think these issues are easy to resolve, so if the host heeds this feedback, it can become "lar doce lar" in no time. Until then, good luck to Samuel and maybe see you again in the future.