Joana' s please is really spacious! And so nice garden with lemon trees! We could choose bedroom, as only 2 of us stayed in Sintra. Everything was fine and nice. As we stayed in February, the apartment was a little bit cold & humid, but it would be a plus in summer. Mattress was too firm for us, but it us a matter of choice, at least it is healthy;-) Communication with Joana was super easy, quick and informative. We are grateful to Joana for her care and support. In general, we had a wonderful stay (we ;-) ), and definitely would try to book your place again when return to Sintra with kids.
PS The most safe and cheap luggage storage is at Tourist Office near Sintra Palace, working till 18.00, we've paid €5 for 2 bags for the whole day.