The flat is rented by the collective managing the Eco-village, however it is not in the Eco-village itself. It is located in the centre of Janas where there are supermarkets, cafes and - most importantly - the wonderful restaurant run by the collective itself. The restaurant is great as there is a small area with groceries etc. and they have concerts, pizza night etc...
Amandine took great care of us and was always quick to respond! You could tell how passionate she is about her project and about getting in contact with people and exchange.
The flat is a convenient place to start explorations to the beach, Sintra or Lisbon (we had a car so I don't know about public transport but I saw lots of bus stations) and Amandine was eager to fix minor things like a small problem with the sink.
If you want the full experience of living in the Eco-village - which again seems like a fantastic project - check into a room in the village itself :)