We have stayed in the Casa Natura for one week and everything was perfect : the appartment is well equiped and has a nice design. We enjoyed most of all the huge rooftop terrace with an amazing view. The situation in Ericeira is very good too, you can be in the ocean in 10-15 minutes by foot.
Also, Luis is very kind and gave us some tips for the rest of our trip.
Do not hesitate, go ! :)