This place is very nice. Quite large with 3 proper bedrooms. Tons of light and plenty of space for a group if you can deal with one bathroom. We were only two but enjoyed the extra room. A nice outdoor area as well but we didn't have time to enjoy. Very functional kitchen with a vintage feeling. There are some great restaurants nearby and Sintra center is about a very pleasant 15-20 minute walk.
And you can walk to the main attractions if you want a good workout! The only drawback was the building is old and has beautiful wooden floors and high ceilings but you can hear the neighbors upstairs from time to time. We travel with earplugs and certainly helped reduce the noise for sleeping. Probably not the best option for light sleepers.