I highly recommend staying at the beach house! We have spent one week there end of June and it was great. The house is really nice, spacious, very clean and ideally located 5 minutes from the beach and 2 from the supermarket. Paula and her sister are great. They were both very flexible for the check in and they did everything to prepare the house at the time I was arriving. Paula was also very reactive and answered to all our questions.
I can highly recommend you to stay there and to enjoy lovely Ericeira.