The apartment is very spacious and can fit 5 people in. We were only 3 so it was huge space for us. There is a supermarket at 3 min walk and bakery/small shops on the ground floor of the building. Elio recommended us some very nice and good restaurants and was very kind to help us or provide us some furniture we were missing in the apartment.
I would recommend Elio and his advices if you want to stay in Ericeira.
The main streets are 5 min walk from the flat and there is a nice promenade along the sea at 3 min walk.