Ana's place is well-situated and nicely appointed — perfectly mid-century. The location is very convenient for walking all around Lisbon — and there's a convenient grocery store nearby for extended stays if you want to cook for yourself (which I did, several times). There's also one of the best cafes in Lisbon nearby (Copenhagen Coffee Lab), as well as several similar spots within 10-15 minutes walking. And up the street you'll find one of the best shopping areas in town, as well as several delicious restaurants.
The interior of the apartment is clean and efficient. The beds were comfortable and the amenities appreciated, and the appliances all worked well and/or had recently been updated.
The apartment did get chilly sometimes (it was a rainy November after all) but there are space heaters available.
I highly recommend paying close attention to how to set up the internal alarm system. Having the extra piece of mind is something you really can't put a price on.