My wife, daughter, and I stayed at ‘the White House’ for two nights. The apartment is sparkling clean, beautiful, and very ‘cool’. We were welcomed by fruit and still-warm bread. Our hosts had many recommendations for us and were happy to answer the questions we had about the best way to see Sintra.
Yes, there are stairs getting up to it, but if these stairs are a worry to you, then Lisbon, with all its staircases and steep hills, will be problematic in and of itself. Truly, they weren’t an issue for us in the slightest.
We would absolutely stay again.