Extremely convenient location, close to the train station, good to stay for a night or two. Apartment is.comfortable, has all you need for the few days, hosts are responsive and check in is easy.
Apartment itself is on the ground floor, next to a quiet street. its quite cozy, has enough space for two (double bed). It has the basic amenities you need, there's an interesting ceiling corner mirror in the bedroom so you can see yourselves while laying on the bed ..... ;)
On the bad side, it had a bit of a smell from the sewage and was a bit damp overall, but nothing too disturbing, plus Sintra itself is pretty humid so it is to be expected.
We just used it to crash for two nights and it served its purpose like a charm!
Hosts left us cookies which I guess is a nice touch ;)