Our hosts were warm and welcoming. The location of the hostel is great for exploring Sintra: it's a 10 minute walk from the train station, far enough from the crowds to be a relief!
We had the double room which looks out on to the main street. There is a lot of street noise during the day, but it's quiet at night. The bed is full size, the mattress very hard, beautiful sheets. Lovely big towels. A very clean house. Perhaps the best breakfast in Sintra! It is generous and includes eggs, yogurt, fresh bread, fruit, coffee and juice.
The only caution is that this IS a hostel, and two toilets and two showers can be shared with up to 12 people. So this is not for travelers who need their own bathroom.