We have been travelling for a year now and this is one of our favorites. It is about 3 blocks from the center of everything on a quiet little street. Good view of the country to the north. The beds were super comfortable with nice cozy duvets so that we could leave the windows wide open all night on the cool October nights. Great appliances and utensils. Really clean.
We used Sintra as a base and from there visited Lisbon instead of the other way around. It was a good call.
Burghard has a porcelain shop near by and was really helpful.
Cant recommend it highly enough.