We absolutely loved our stay at once upon a time Sintra.
The host was very responsive and sent extremely clear instructions for check in.
The location is amazing because you can walk into Sintra center but you are also far out a bit so it’s easy to catch an Uber if you want to go to Lisbon or Cascais/etc.
Beautiful access to hiking if you want to hike up the the palace.
Also, there is a quaint and lovely tapas restaurant just across the street and there is a lovely cafe up the road as well. We also had amazing salmon and pizzas up the road at Taverna dos Trovadores.
Would definitely stay here again.