The apartment is very nice (I'll describe below). Location is perfect to see Lisbon. Maria is a first-rate communicator and a very nice woman.
THE APARTMENT: comfortable and on the cozy side -- the living room is the "cozy part", including the seating-area -- lacking an abundance of light sources, if that's an issue. The bedroom is a good size and the bed is extremely comfortable. The bathroom is fine; though, my only note is if you are 6-foot tall (plus or minus a few inches) you will have to crouch down to use the shower, as it sits in the slant of the roof. The kitchen is well appointed though the lighting is not great. My biggest challenge with the kitchen is that the washing machine door wasn't working so my clothes were stuck inside for three days as I and Maria (the host) tried to fix it. Maria called a repairman who finally did. In truth, I feel not having access to my clothes for several -- and at the end of a wash cycle, so I had to go out and purchase some daily garments to use -- definitely warranted a refund of some kind, even a modest one; which I have received for far-less obstructions in Airbnb apartments.
That's my largest misgiving of my time in the apartment and my expense.
Overall, given location, communication, design and setting, I enjoyed my time in the flat.