I had a great stay at Luísa's place. Her nephew was there to greet me when I arrived and showed me around the whole place and talked me through the nuances. He even popped back in quickly when I couldn't figure out the water heater (that he already showed me how to use...) So patient!
The space itself is pretty much exactly as advertised. The bathroom is pretty tiny but it worked just fine for me! I'm about 5'5" and just fit in the shower so if you're taller than that be aware. Also there is a steep set of stairs up to the apartment (top floor) so if you're not able bodied or have a lot of luggage this might be inconvenient for you. Otherwise, the bed was comfy and the window out onto the street was great to get some fresh air and sunlight.
Location-wise it was very walkable to many popular parts of Lisbon and was also close to metro and bus stations. I had a good, hassle-free stay.