I spent 4 nights here. The apartment is large and spotlessly clean. I did not try to cook but it has a large fridge and a working cooker.
There is plenty of storage space. Bathroom is clean with a shower that works well. Internet is also great

It is in old Sintra, about 300 meters from the centre, most major attractions and shops and restaurants are within walking distance.
Although close to the center, the apartment is in a quiet street.
Sintra itself is beautiful although you must walk up a hill or down a hill to get anywhere.

I would recommend this place to anyone, especially those who want to see the sights but like to sleep in quiet :)

Telmo & Diogo were great hosts, waiting for me after I got a little lost on the way. Sintra has a lot of small winding streets which take a few hours to get familiar with.