We loved this studio apartment in the heart of Sintra, it gets beautiful light during the day and has a great view of Quinta da Regaleira. The bed was quite firm but comfy and huge. The room was nicely warm even as the weather was getting cooler (Mid November).
There was some construction happening across the street but they stopped during the weekend. There is no bathtub but the shower was great — just a bit of a learning curve with getting the hot water and temperature right.
Overall we would recommend it as a very convenient, central and reasonably priced stay in Sintra.