The location is very close to National palace, really Central Area.
The communication of direction and not to use google map etc is actually quite confusing. But it’s generally uneasy to drive in Sintra, so not the host’s issue
I didn’t pay the city tax online before I arrive, therefore I didn’t get the passcode I needed. I suggest guests to pay upfront, although I thought it’s a bit unsure about security of paying on that link. (It ended up ok.)
Main down side is the smell of old pipe in the unit, especially in the bathroom. I think it might be an issue of all old buildings, but I can’t confirm.