For our group of ten, we rented both properties at Villa Sociedad. Would highly recommend the combination, if it's available, because the guest house provides a lovely, large, secluded sleeping space (air conditioning works great, it's not too sunny and the beds are very comfortable), and the big house has dramatic vistas, an enormous deck and a beautiful salt water pool to play in.
It's like having your own private estate near the beach. You aren't aware of any other houses, the sunsets are spectacular, the landscaping is very attractive and the location isn't far from beaches, town, etc. Also, Paula, the owner, was very responsive and helpful, and gave us great recommendations for places to eat and shop.