My girlfriend and I have stayed at six Airbnbs in Lisbon, and this was by far our favorite.
The apartment was more spacious than expected, clean (smells good), and luxurious with nice touches (e.g. automatic light switches, many lamps, and a huge table to work on). The kitchen was thoroughly equipped, and the bed was comfortable. Weather here has been really hot but somehow the apartment was naturally very cool, and we never needed a fan or AC. It's the perfect place for resting after a long day/night.
The location is also great. It's a 5-minute walk to groceries (Pingo), a gelato store (Mu), a and beautiful garden (Campo Martires da Patria) with a parking lot where you can lie in the grass. There are also dozens of luxury/boutique stores and cafes nearby. I recommend the waffles at Stanislav Cafe for brunch. I think this place would be best for families, couples, and solo travelers.
Lastly, Antonio and Marli are superhosts for a reason. They have both gone out of their way to help and be resourceful. I have never felt so comfortable with my hosts, and there is a lot of trust. Looking forward to coming again!