We had been to Sintra before so we only stayed at Joana's place for two nights. It's the lowest level of a three story house and we entered by using a lock box. There was plenty of room for the three of us with two bedrooms, full kitchen, sitting room, bath and entry. In addition there were chairs outside. It was just cool enough so when we returned to the house in the evenings we did not spend time outside in the garden area. The house was perhaps a mile (one and half kms) from the center of Sintra.
There was a really good heater in the sitting room which we used in the evenings. The flat was certainly clean too. A full grocery store was a few minutes away.
We enjoyed staying there and recommend it highly.