Maria Antonia's place was lovely! I had such a great stay in the guest house, which has a small kitchen (microwave, fridge, sink, toaster, Nespresso machine, and hot plate), a sitting area, large dining table, and sleeping loft.
I was able to catch an Uber ("almost legal" in Portugal, according to one of our drivers) very easily every morning, in less than 10 minutes. The bus system is also an option if you don't have a car, which Maria was very helpful in showing me how to use (but I'm a public transit failure most of the time, so this option was not for me).
Maria was very helpful the day I arrived, she even took me to the grocery store since it was a Sunday and the one within walking distance to her house was closed.
Her house is very conveniently located to Sintra, Cascais, Estoril, and not too far from Lisbon, either.
I really enjoyed my stay and would go back!