I would strongly recommend the Cascais Coast house.

8 friends stayed here in July and it had everything we needed (nice beds, showers, good wi-fi, BBQ, dishwasher etc.) The view out to the beach and ocean is incredible. It is also only a short drive from Cascais, which is a really nice town.

Bernardo was a great host. He gave us a couple of surf lessons down at Guincho beach (10 min drive), recommended places to eat, and drove us into Lisbon for an evening out.

We would come again.